Update unstable to v1.1.5

This brings in the new 1.1.5 version and updates the bower manifest accordingly.

There are also a few other changes in this pull request (if you'd rather I split them in multiple requests, please let me know):
* Rename `components.json` to `bower.json`
* Delete an erroneous minified file
* Update the bower manifest to depend on the `angular-unstable` package, rather than `angular` which doesn't have the unstable version tagged
* Reword the README file

I'm also thinking of registering this repository with Bower as `angular-mocks-unstable`, unless someone has a strong reason for me not to? I know we're all waiting for Bower to support unstable branches in a stable way, but until then...