* abi-gen: inline @0x/abi-gen-templates And use those inlines by default, relieving caller of having to specify --template and --partials all the time. Simplify abi-gen usage in all package.json's, omitting --template and --partials to defer to the defaults. * abi-gen: Update CHANGELOG.json * contract_wrappers.py: be a user of abi-gen