Finish release-0.2.1
Changed the description in the README file and set that also in the composer file.
Correctly quote the value depending on it's type.
Removed unused use import.
Added tests for the Primitive abstract classes.
Modified test function names and extended the tests coverage.
Added a contains() function.
Fixed some string functions.
Added more coverage to the String tests.
Changed deprecated preg_replace pattern modifier usage.
Added a random function for each of the numeric primitives (Int and Float) along with some tests.
Changed the calls to mt_rand to the random functions of the primitives.
Added Travis config for PHP 5.5
Modified the readme file to include missing or outdated info.
Refactoring of the Arr class. Removed all functions but the basic functions. Other functions will be revised and added as convenient.
Placed missing error type.
Added more coverage for the Float primitive tests.
Added more coverage to the String primitive tests.
Fixed the docblocks as false is also returned from the random functions in certain cases.
Placed the tests in their own namespace.