adding missing file
implementing basic blockchain support for data feeds
resolve conflicts
register update feed op with operation factory
updating webwallet
implementing price change limits based on the 24 hour moving average
merge from develop
implement data feed validation
updates toward publishing price feeds
Merge branch 'develop' of github.com:BitShares/bitshares_toolkit into develop

Conflicts:
	programs/web_wallet
price feeds are now implemented
only keep a short undo history
adding market fees to asset record
price feeds and median price are now both used to restrict the market
bug fixes
fix user issued markets
basic mail server library
defining some message types
update wrapping
fix bugs in bid/ask