Tests added

[TomasVotruba]

Test status - OK: https://travis-ci.org/TomasVotruba/nette-identity-doctrine

Test suite runs for PHP 5.3-7, includes Nette 2.1, 2.2 and 2.3 (all three only for PHP 5.6, no need to test Nette for PHP versions).

(PHP 7 currently fails due to some DateTime changes.)

Among other changes:

• bump min version to Nette 2.1, since Nette 2.0 is in EOL since 2015-01
• bump PSR-0 to PSR-4, since PSR-0 is deprecated since 2014-10
• includes Nette DI fix: https://github.com/Majkl578/nette-identity-doctrine/pull/5/files, https://github.com/Majkl578/nette-identity-doctrine/pull/7/files
• simpler README, more clear entity (with PHP 5.3 syntax and annotations)

[TomasVotruba]

@Majkl578 Should be ready now. Please check.

[TomasVotruba]

Ups :/

[TomasVotruba]

Ok, now it's fixed (typo: evn/env).

When everything is ok, I can repush with clean commits.

Also I'd rename lib to src, since it's most used form.

[TomasVotruba]

Ping @Majkl578

[Majkl578]

@TomasVotruba: Hi, thanks for your great work, I rebased it and pushed as 0d16457 + 657455a + c60283d + b9bc649 + 109c1c7. Sorry for being late to the party. :)

[TomasVotruba]

@Majkl578 Thanks! I wonder if you still use Nette :)