Merge branch 'master' of https://github.com/ethereum/ethutil-go

* 'master' of https://github.com/ethereum/ethutil-go:
Fixed RLP
Removed old methods
Removed old functions, updated rlp enc/dec and updated Value
Added slice casting function
Updated docs
Test update
Added build image
Moved function
Trie now using Value instead RlpValue
Fixed encoding byte slices larger than 55
Removed debug log
Changed a method
Changed version number
Casting to Uint fixed from direct bytes slice
Versioned to 1.2
Interop
Bumped version
Read config from a specified dir
Optimised patricia trie with a caching mechanism