Enumeratable accounts (#195)

* 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.

* Address grumbles.

* Revert bad `map_or`

* Rebuild binaries, workaround.

* Avoid casting to usize early.

* reenable sync tests

substrate/Cargo.lock

@@ -1233,6 +1233,7 @@ dependencies = [
  "substrate-primitives 0.1.0",
  "substrate-runtime-executive 0.1.0",
  "substrate-runtime-io 0.1.0",
+ "substrate-runtime-primitives 0.1.0",
  "substrate-state-machine 0.1.0",
 ]
 
@@ -1430,12 +1431,14 @@ dependencies = [
  "ed25519 0.1.0",
  "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "polkadot-api 0.1.0",
  "polkadot-primitives 0.1.0",
  "polkadot-runtime 0.1.0",
  "substrate-client 0.1.0",
  "substrate-codec 0.1.0",
  "substrate-extrinsic-pool 0.1.0",
+ "substrate-keyring 0.1.0",
  "substrate-primitives 0.1.0",
  "substrate-runtime-primitives 0.1.0",
 ]
@@ -1559,7 +1562,7 @@ dependencies = [
  "lazy_static 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.41 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1922,6 +1925,9 @@ dependencies = [
 [[package]]
 name = "substrate-codec"
 version = "0.1.0"
+dependencies = [
+ "arrayvec 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
 [[package]]
 name = "substrate-executor"
@@ -2141,6 +2147,7 @@ version = "0.1.0"
 dependencies = [
  "hex-literal 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
  "substrate-codec 0.1.0",
  "substrate-primitives 0.1.0",
  "substrate-runtime-consensus 0.1.0",
@@ -2267,6 +2274,7 @@ dependencies = [
  "hex-literal 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "safe-mix 0.1.0",
  "serde 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.64 (registry+https://github.com/rust-lang/crates.io-index)",
  "substrate-codec 0.1.0",
  "substrate-primitives 0.1.0",
  "substrate-runtime-io 0.1.0",