add symbols
add Unit Util
edit views for bits
edit views for bits
fix amounts link
fix some hard coded btc strings
add display unit selector
Merge branch 'feature/support_bits' into develop

Conflicts:
	bither-android/src/net/bither/ui/base/BtcToMoneyButton.java
	bither-android/src/net/bither/util/StringUtil.java