Dump genesis to JSON file (#218)

* Merge remote-tracking branch 'origin/master' into gav-xts-dont-panic

* Update wasm.

* consensus, session and staking all panic-safe.

* Democracy doesn't panic in apply.

* Fix tests.

* Extra helper macro, council depanicked.

* Fix one test.

* Fix up all council tests. No panics!

* Council voting depanicked.

* Dispatch returns result.

* session & staking tests updated

* Fix democracy tests.

* Fix council tests.

* Fix up polkadot parachains in runtime

* Fix borked merge

* More Slicable support

Support general `Option` and array types.

* Basic storage types.

* Existential deposit for contract creation

* Basic implemnetation along with removals

* Fix tests.

* externalities builder fix.

* Tests.

* Fix up the runtime.

* Fix tests.

* Add generic `Address` type.

* Initial function integration of Address into Extrinsic.

* Fix build

* All tests compile.

* Fix (some) tests.

* Fix signing.

* Push error.

* transfer can accept Address

* Make Address generic over AccountIndex

* Fix test

* Make Council use Address for dispatch.

* Fix build

* Bend over backwards to support braindead derive.

* Repot some files.

* Fix tests.

* Fix grumbles

* Remove Default bound

* Fix build for new nightly.

* Make `apply_extrinsic` never panic, return useful Result.

* More merge hell

* Doesn't build, but might do soon

* Serde woes

* get substrate-runtime-staking compiling

* Polkadot builds again!

* Fix all build.

* Fix tests & binaries.

* Reserve some extra initial byte values of address for future format changes

* Make semantic of `ReservedBalance` clear.

* Fix panic handler.

* Integrate other balance transformations into the new model

Fix up staking tests.

* Fix runtime tests.

* Fix panic build.

* Tests for demonstrating interaction between balance types.

* Repot some runtime code

* Fix checkedblock in non-std builds

* Get rid of `DoLookup` phantom.

* Attempt to make transaction_pool work with lookups.

* Remove vscode settings

* New attempt at making transaction pool work.

* It builds again!

* --all builds

* Fix tests.

* New build.

* Test account nonce reset.

* polkadot transaction pool tests/framework.

* Initial draft (working).

* Address grumbles.

* Revert bad `map_or`

* Rebuild binaries, workaround.

* Avoid checking in vscode

* reconnecting, shared, slog

* CLI options for name and telemetry url

* ensure telemetry url imples enabled

* Avoid casting to usize early.

* Provide on-connect event for session message

* Better port

* heartbeat and some renaming

* transaction pool stuff

* minor renaming.

* report telemetry

* cleanups.

* Fix for previous cleanup

* dump genesis, dev mode, renaming

* Rework chain spec/config &c. to allow for genesis file loading.

* Avoid producing genesis storage when unneeded

* Allow reading JSON genesis state dumps

* tests work again

* better logging.

* Fix wasm build.

* Introduce PoC-1 spec

* Made block message compatible with poc-1

* Squashed changes for dumping genesis block.

* Binaries.

* Made block message compatible with poc-1

* Remove dead code.

* Fix bad merge.

* Argument passing and returning values when invoking sandboxed funcs (#189)

* Fixed block download sequence (#223)

* Trie-based execution proof (#177)

* TrieBasedBackend

* trie tests

* redunant return_value removed

* use Trie::get_with to record trie proofs

* Relaying tx/blocks by light clients (#190)

* do not import external transactions into light tx pool

* do not announce blocks on light clients

* blocks_are_not_announced_by_light_nodes

polkadot/runtime/src/parachains.rs

@@ -199,9 +199,9 @@ impl<T: Trait> Default for GenesisConfig<T> {
 }
 
 #[cfg(any(feature = "std", test))]
-impl<T: Trait> runtime_primitives::BuildExternalities for GenesisConfig<T>
+impl<T: Trait> runtime_primitives::BuildStorage for GenesisConfig<T>
 {
-	fn build_externalities(mut self) -> runtime_io::TestExternalities {
+	fn build_storage(mut self) -> runtime_io::TestExternalities {
 		use std::collections::HashMap;
 		use runtime_io::twox_128;
 		use codec::Slicable;
@@ -229,7 +229,7 @@ mod tests {
 	use super::*;
 	use runtime_io::with_externalities;
 	use substrate_primitives::H256;
-	use runtime_primitives::BuildExternalities;
+	use runtime_primitives::BuildStorage;
 	use runtime_primitives::traits::{HasPublicAux, Identity, BlakeTwo256};
 	use runtime_primitives::testing::{Digest, Header};
 	use consensus;
@@ -264,19 +264,19 @@ mod tests {
 	type Parachains = Module<Test>;
 
 	fn new_test_ext(parachains: Vec<(Id, Vec<u8>)>) -> runtime_io::TestExternalities {
-		let mut t = system::GenesisConfig::<Test>::default().build_externalities();
+		let mut t = system::GenesisConfig::<Test>::default().build_storage();
 		t.extend(consensus::GenesisConfig::<Test>{
 			code: vec![],
 			authorities: vec![1, 2, 3],
-		}.build_externalities());
+		}.build_storage());
 		t.extend(session::GenesisConfig::<Test>{
 			session_length: 1000,
 			validators: vec![1, 2, 3, 4, 5, 6, 7, 8],
-		}.build_externalities());
+		}.build_storage());
 		t.extend(GenesisConfig::<Test>{
 			parachains: parachains,
 			phantom: PhantomData,
-		}.build_externalities());
+		}.build_storage());
 		t
 	}