File upload styling

Add some styling for the file upload field, now it shows the previously uploaded document if it exists.

![upload_default](https://cloud.githubusercontent.com/assets/87140/4918314/c3c80d7c-64ef-11e4-8645-fddc195afec8.png)

![upload_with_document_selected](https://cloud.githubusercontent.com/assets/87140/4918318/c773dece-64ef-11e4-845f-8adb29b3e646.png)

![upload_with_current_document](https://cloud.githubusercontent.com/assets/87140/4918321/cb867b20-64ef-11e4-8b4f-0a9c91ce1b27.png)

This pull request also includes a fix for the `grunt watch` task which was not compiling the stylesheets for Internet Explorer.