Merge pull request #3 from josephyzhou/master

debug logging directory check
Updated RLP according to spec and added a WIP Dynamic value
Merge branch 'master' of github.com-obscure:ethereum/ethutil-go
String => Str
Length > Len
More tests
Added travis
Merge branch 'master' of https://github.com/ethereum/ethutil-go

* 'master' of https://github.com/ethereum/ethutil-go:
  Added travis
  More tests
  Length > Len
  String => Str
  Updated RLP according to spec and added a WIP Dynamic value