Added preferences activity with some settings
Connected prefs with code
Added delay preference and IMAP IDLE functionality
Fixed stopping service during IDLE waiting
Added new preferences to preferences screen
Little changes; added menu item to contacts list editor
Preparations to saving/restoring contacts list
Added saving contacts to and reading from file, implemented addition of
new contacts
Implemented editing and removing elements from contacts list
Added some comments
Merge pull request #7 from kkieczka/android-contacts-list

Android contacts list