This change allows me to install your gem.

Re: http://help.rubygems.org/discussions/suggestions/2747-please-remove-the-active_support-gem

Otherwise I get all sorts of errors:

````
Could not find gem 'active_support (>= 0) ruby', which is required by gem 'lita-pagerduty (>= 0) ruby'
```
Merge pull request #6 from darron/patch-1

This change allows me to install your gem.