[Fix] Removed peer dependencies.

Peer dependencies should not go from the parent to the children. The children
should peer depend on the parent project and not the other way around.
Closes #767

BREAKING CHANGE:
People will need to explicitly install the plugins they need. `karma init`
should help with this.

Removed plugins that need to be installed explicitly are:

* karma-jasmine
* karma-requirejs
* karma-coffee-preprocessor
* karma-html2js-preprocessor
* karma-chrome-launcher
* karma-firefox-launcher
* karma-phantomjs-launcher
* karma-script-launcher