fix for  undefined index errors
no need to use variable, plus it seems to be empty.
use actual domain as this is always going to be 'bitbucket.org'
at request of @pdclark
Merge pull request #27 from afragen/bugfix/github-uri

no need to use variable, plus it seems to be empty.
Simplify init; Force plugin to override library

Simplify loader:
* Move constants to class constants.
* Remove init function.

Use as library:
Update readme with code for users adding as library.
Merge branch 'develop' of github.com:brainstormmedia/git-plugin-updates into develop
Ignore PluginURI header for updates by default.
Remove log method. Not being used.
move 'host' outside of this check
Merge pull request #24 from afragen/bugfix/undefined-vars

Fix `undefined index` notices.
Merge branch 'develop' of github.com:brainstormmedia/git-plugin-updates into develop