Porting test to PHPUnit
Added coveralls, fixes
PHPCS start checking unit-tests, PSR2 fixes, fix example test for Zephir\Config
README with coverage dependecy latest stable and total downloads icons
Composer.json fixes

- Contributors ucfirst

- require gmp for dev and json for default

- added link for issues
Merge pull request #202 from zaets28rus/phpunit_codecoverage

Porting test to PHPUnit