Send again or phone

This is a prototype simple PR that fixes an issue and involves both code and GUI fixes so Fred and I can get our workflow down. PR updated to be to textSecure branch

in the Code Verification View:
• enables the "Send Again button" 
• enables the display of the number the user entered in the Registration View in this subsequent scene (so they can see whether they should go back or not)
• enables the "call me instead button"
• has unified disabling of UI buttons which result in server calls (all buttons but the cancel buttons) while there is an extant server call