Updated composer.json to require stable 3.1 release
Merge pull request #5 from toddvalentine/3.1

Updated composer.json to require stable 3.1 release
BUGFIX $url is undefined variable
Merge pull request #8 from nhorstmeier/undefined-variable

BUGFIX $url is undefined variable
Merge remote-tracking branch 'origin/3.1'
Aliased master as 3.2