IE11 support

There are 28 failing assertions in the master branch in IE11.
On the subject of selectivity, it does seem to link only the relevant files:

```
➜  wymeditor git:(issue_515) ✗ ls -l src/lib 
total 12
lrwxrwxrwx 1 shahar shahar 85 Jul 22 20:46 jquery.browser.js -> /home/shahar/src/wymeditor/src/bower_components/jquery.browser/dist/jquery.browser.js
lrwxrwxrwx 1 shahar shahar 64 Jul 22 20:46 jquery.js -> /home/shahar/src/wymeditor/src/bower_components/jquery/jquery.js
lrwxrwxrwx 1 shahar shahar 68 Jul 22 20:46 require.js -> /home/shahar/src/wymeditor/src/bower_components/requirejs/require.js
```
Perhaps because the package descriptions specify the 'main' dist files. Just guessing.