Fixed build system and updated README

Account for the `bower_components` folder instead of `components`
Added `bower install` in README section for building.

Example error

```
$ grunt
Running "clean:folders" (clean) task

Running "jshint:devel" (jshint) task
>> 0 files lint free.

Running "rig:files" (rig) task
>> Failed to rig file "src/api.js
>> Failed with error: "Error: Unable to find target for: ../components/package-manager/dist/mtvn-package-manager.js
>> Failed with error: "Error: Unable to find target for: ../components/package-manager/dist/mtvn-package-manager.js
Warning: Unable to find target for: ../components/package-manager/dist/mtvn-package-manager.js Use --force to continue.

Aborted due to warnings.
```