Config travis for using containers and cache

http://blog.travis-ci.com/2014-12-17-faster-builds-with-container-based-infrastructure/
Signed-off-by: Rogerio Prado de Jesus <rogeriopradoj@gmail.com>
Fake tests in DateDiff and DateUtil

Signed-off-by: Rogerio Prado de Jesus <rogeriopradoj@gmail.com>
Create test Rock_Datet_DateObjTest::testGetTimeStampReturnsInt()

Signed-off-by: Rogerio Prado de Jesus <rogeriopradoj@gmail.com>
Include coverage-text to stdout in phpunit.xml.dist

Signed-off-by: Rogerio Prado de Jesus <rogeriopradoj@gmail.com>
Create test Rock_Datet_DateObjTest::testGetFormatReturnsString()

Signed-off-by: Rogerio Prado de Jesus <rogeriopradoj@gmail.com>
Create test Rock_Datet_DateObjTest::testGetDateReturnsString()

Signed-off-by: Rogerio Prado de Jesus <rogeriopradoj@gmail.com>
Run php-cs-fixer in /src

Signed-off-by: Rogerio Prado de Jesus <rogeriopradoj@gmail.com>
Include real tests in Rock_Datet_DateDiffTest

Signed-off-by: Rogerio Prado de Jesus <rogeriopradoj@gmail.com>
Create test Rock_Datet_DateUtilTest::testSetNovaDataChangesDateObj()

Signed-off-by: Rogerio Prado de Jesus <rogeriopradoj@gmail.com>
Create test Rock_Datet_DateUtilTest::testGetSumDaysReturnsRock_Datet_DateObj()

Signed-off-by: Rogerio Prado de Jesus <rogeriopradoj@gmail.com>
Create more tests in Rock_Datet_DateUtilTest

Signed-off-by: Rogerio Prado de Jesus <rogeriopradoj@gmail.com>
Merge pull request #3 from RockPhp/unit-tests

Unit tests