Migrate to simpletest/simpletest for unit tests
Allow falsy ID for plans

I encountered this issue, and saw that this was already reported in #55.
The fix I've included will solve the issue, but might impact other things, so this should be tested carefully.
Add test for plan, allow falsy id in request, add composer.phar to .gitignore
Fixed typos
Added PHP 5.6 in travis-ci
Added HHVM in travis-ci
Merge pull request #74 from pborreli/travis-typos

Added PHP 5.6/HHVM in travis-ci
Merge pull request #53 from vierbergenlars/simpletest-migration

Update simpletest dependency
Switch tabs to spaces for indenting lines
Change lines to be less then 80 characters
Change control structure spacing
Update multiline function calls indentation
Rename variables to not contain numbers
Change variables to Camel Case
Change member variables declared "public" that start with an underscore.
Putting function opening brace on a new line
Keep ( on a seperate line from the brace
Clean up long line
Opening brace should be on new line
Multi-line function call not indented correctly