Documentation & Whitespace updates
Correct Package in documentation
update composer.json and .gitignore files
Add in PHP 5.5 testing now it has been released
Update Test Dependency files
Update test for latest ga.js version number
Deal with set-cookie response headers

Although Google Analytics doesn’t currently set cookies on it’s own
domain this makes the code more generic and deals with the possible
multiple occurences of this response header
Remove @access docblock properties as they're now ignored
Minor PSR-2 correction
Update Browscap URLs, update ga.js to latest version, update test dependency files, update changelog ready for merge