GVoice Callback

Invalid date

v0.2.7
1. Allow selection of callback numbers in confirmation dialog
2. When account needs refreshing, the "Cancel" button changes to "Refresh" and starts the Login activity
3. Bug fixes

v0.2.6
1. Increase spacing between buttons in confirmation dialog
2. Bug fixes

v0.2.5
1. Auto close after timeout
2. Add button to cancel callback

v0.2.3
Merge callback into outgoing call in phone log