bump strider-slack to 0.2.1

* improved the help area (showing example job object under trigger types)
* used browserify to bring the angular shit under control / make things more testable / reusable
* added tests to handle various cases like commit message should have a link, etc
```
worker
  ✓ emits properly
  test pass text
    ✓ uses the right icon
    ✓ links happy text to the logs
    ✓ doesn't say fail
    manual trigger
      ✓ does not try to render a link to an undefined commit
    commit trigger
      ✓ links commit message to trigger url
  test fail text
    ✓ uses the right icon
    ✓ links unhappy text to the logs
    ✓ doesn't say pass


9 passing (48ms)
```
![screenshot 2014-06-12 19 58 57](https://cloud.githubusercontent.com/assets/175305/3266192/27dc9cf8-f2a7-11e3-8a4b-8e8e8c296b85.png)
![screenshot 2014-06-12 20 03 05](https://cloud.githubusercontent.com/assets/175305/3266195/3039ed42-f2a7-11e3-912d-7f3059e8f9f1.png)