#1222, jira-536, import changes from the dawn 2.x based branch.

Travis tests

Identity contract (part 2)

fix problem with proxy that arises from compile time code values on the old singleton and the bugfix for reading other contracts

add new iterator based db api

fix abi tests

more chain test fixes

fixes for wasm memory tests

the removal of `init` from `setcode` moved compilation AND validation of wasm to the first action.  We should do validation during `setcode` but doing this properly requires additional work.  This is a temporary fix

Additionally, the injector code was failing when hit with hand crafted wasm that had no types/import section(s)