abstract entry keyboard view
add amount keyboard xml
add amount entry keyboard
add amount keyboard to send activity
fix amount keyboard color
add amount keyboard to unsigned tx activity

fix #11
Merge branch 'feature/keyboard_to_input_amount' into develop

Conflicts:
	bither-android/src/net/bither/ui/base/dialog/DialogPassword.java
	bither-android/src/net/bither/ui/base/dialog/DialogPasswordWithOther.java