Add "new application" button on package page

Fixes [MLHR-1414](malhar.atlassian.net/browse/MLHR-1414).

Also:

*added "@" between packageName and packageVersion in breadcrumbs
*flattened the design a little bit (removed bootstrap 2.x-ish theme)
*"edit DAG" breadcrumb now just "edit"
*swapped hardcoded href="" urls for dt-page-hrefs

![image](https://cloud.githubusercontent.com/assets/1390651/4335236/f54110b2-3ff9-11e4-8bec-fd2bba6b9ecf.png)

![image](https://cloud.githubusercontent.com/assets/1390651/4335240/fe36469c-3ff9-11e4-81e2-e5dc6ccd044e.png)

![image](https://cloud.githubusercontent.com/assets/1390651/4335244/0e1d0b68-3ffa-11e4-8412-b3b5d88ed86e.png)