fix: extend SimpleConfiguration instead of Configuration
Merge pull request #14 from cbracken/adapter-fix

fix: extend SimpleConfiguration instead of Configuration
fix: rewrite the plugin to work with Karma 0.10

This is pretty much rewrite of the plugin to:
- work with Karma 0.10+
- catch adding new files
- less dependency on Karma internals
- more efficient

Closes #11
fix: report suite names

Closes #12