Adds Json::pretty_print method for PHP 5.3. Adds unit test for Json class.
Making indentation match JSON_PRETTY_PRINT
Adds test pattern for JSON_UNESCAPED_SLASHES
Fixes differences in Json between 5.3 and 5.4
Renames Json test file. Imports test array from file.
Fixes order of arguments in assertEquals(expected, actual)
Json::pretty_print should do strlen only if it needs to
Merge pull request #17 from webbj74/json

Fixes compatibility issue in Acquia\Common\Json between PHP 5.3 and PHP 5.4+