* Make extrinsics extensible.
Also Remove old extrinsic types.
* Rest of mockup. Add tips.
* Fix some build issues
* Runtiem builds :)
* Substrate builds.
* Fix a doc test
* Compact encoding
* Extract out the era logic into an extension
* Weight Check signed extension. (#3115)
* Weight signed extension.
* Revert a bit + test for check era.
* Update Cargo.toml
* Update node/cli/src/factory_impl.rs
* Update node/executor/src/lib.rs
* Update node/executor/src/lib.rs
* Don't use len for weight - use data.
* Operational Transaction; second attempt (#3138)
* working poc added.
* some fixes.
* Update doc.
* Fix all tests + final logic.
* more refactoring.
* nits.
* System block limit in bytes.
* Silent the storage macro warnings.
* More logic more tests.
* Fix import.
* Refactor names.
* Fix build.
* Update srml/balances/src/lib.rs
* Final refactor.
* Bump transaction version
* Fix weight mult test.
* Fix more tests and improve doc.
* Bump.
* Make some tests work again.
* Fix subkey.
* Remove todos + bump.
* Ignore expensive test.
* Bump.
Shawn Tabrizi