Merge pull request #1 from afrank/master

telling RPC call to use existing socket connection
PEP8 edits
Merge remote-tracking branch 'origin/master'

Conflicts:
	ripplepy.py
pep8
add Uint256 class roughly equivalent to rippled uint256
class for on disk rippled databases
get ledger header info
validate hash, fetch from rocksdb, get sql ledger record
catch import exception for rocksdb
got hash integrity check working