fix(plugins) plugins now work with instances of Inject

the extras for inject surrounding the non AMD plugins were never modified to
work with the new instance based designs. This change allows a global
INJECT_PLUGINS object to exist, which can then be plugged in to.

BREAKING CHANGE
The prior inject-plugins.js file is no longer a part of recent, and the
plugins need to be included indivudally. Additionally, a plugin needs to be
enabled by passing the instance of Inject to the plugin method:

INJECT_PLUGINS.css(Inject); // adds the CSS plugin to the current instance
fix(grunt) version string properly populated

During the 0.7.0 refactor, the version string got lost. This restores
the version string so you can reference the .version property and get
the build information again.