Namespace and unittest migration

Generic
- [x] use foobugs-standards fork of codesniffer
- [x] make usage as easy as possible (with composer)
- [x] psr-2
- [x] travis configuration
- [x] various spelling issues fixed

Namespace and Coding Standard:
- [x] Generic
- [x] Deprecated
- [x] Extensions
- [x] Functions
- [x] Php
- [x] Snmp
- [x] PHP_CodeSniffer

UnitTests:
- [x] Generic
- [x] Deprecated
- [ ] Extensions
- [ ] Functions
- [ ] Php
- [ ] Snmp