v0.15.0-rc0

cosmos/cosmos-sdkv0.15.0-rc013-04-2018prerelease

BUG FIXES

• [store] MountStoreWithDB without providing a custom store works.

Also includes previous branches merged to develop:

FEATURES:

• [types] Add CacheContext

• [???] Add auto sequencing to client

BREAKING CHANGES

• [wire] Remove go-wire, use go-amino

• [store] Add SubspaceIterator and ReverseSubspaceIterator to KVStore interface