Merge pull request #1 from boris-savic/master

Requirements
added .gitignore
Merge pull request #3 from boris-savic/master

Custom registration & user
Updated .gitignore, executable manage.py
Setup logging.
SMS refactoring
Register errors, activation page.
User full_number
Multiple SMS backends
Contacts app
Messaging app
Tests
Merge pull request #4 from bancek/master

Contacts, messaging, tests
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