Improved EntrustTest

Improved EntrustTest.php.
Committed git's auto-normalization of line endings to LF
resulting from addition of .gitattributes in #165.
Also, added 3 fixes matching those in pending PR #166:
1. Entrust.php: $_app array access to $app prop access
2. git mv src/Zizaco/Entrust to src/Entrust
3. composer.json autoload to psr-4
Merge pull request #168 from jobrios/improve-tests

Improved EntrustTest