update readme
relocate export_history code
handle coinbase transactions explicitly
Merge remote-tracking branch 'upstream/master'

Conflicts:
	README
	gui/qt/lite_window.py
Merge remote-tracking branch 'electrum-ltc/master' into electrum-doge

Conflicts:
	README
	gui/qt/lite_window.py
fix readme for DOGE
Exchange rate update

use exchange rate value instead of string to calculate balance
Merge pull request #665 from wozz/exchange-value

Exchange rate update
Merge remote-tracking branch 'upstream/master' into electrum-doge
Merge pull request #5 from wozz/electrum-doge

Merge Upstream