License eris-db to Apache2.0 for eris-db v0.16

licence: remove various GPLv3 copyright headers;

event_new: remove unused package that had been copied for discussion

monax: lingering eris -> monax company rename

licence: last pass, further cleanup

Release 0.16 - alignment with consolidated tooling wrt chain making

Introduce more strongly typed SNatives and contract templates

Change case convention for permissions contract to match solidity style guide, add missing godoc comments, automate signature test

Refactor templating to util, move 'Solidity' types to a more proper abi package, improve documentation of permissions snatives and improve argument and return types

Introduce more strongly typed SNatives, templates for generating contract, and test for permissions contract

Cleanup: introduce word256 and remove dependency on tendermint/go-common

Function signatures automated and fix set global

word256: pull tendermint/go-common relating to word256 into eris-db for permissions and eris-mint (TODO)

genesis: re-introduce GenesisTime in GenesisDoc

Issue434: cleanup comments with respect to internal time

circle: deploy version tagged image from develop

updating develop with intermediate fixes from release-0.16