Laravel Console Mutex Versions Save

• Added separate branch and release for Laravel 5.3;

• Added separate branch and release for Laravel 5.2;

• Added separate branch and release for Laravel 5.1;

• RuntimeException used for immediate stop of command execution.

Useful for complex commands, where few initialize actions are take place. If initializeMutex is first, all other initializations would be skipped automatically now.

• Made different Travis test envs more independent;

• phpredis client supported for redis strategy, as well as predis client;

• Readme improved;

• Added the database port to MySqlLock;

• Tagged all points of Laravel backwards compatibility logic;

• Minor tests fixes;