Adding tests and abstracting transport
Merge pull request #4 from willwashburn/remove-54-dependency

Remove dependency on PHP 5.4
Merge remote-tracking branch 'upstream/master'

Conflicts:
	src/KISSmetrics/Client.php
Merge pull request #3 from Gargron/master

Adding tests and abstracting transport
Merge pull request #1 from kissmetrics/master

Merging in new changes