ngGrid pagination controls

- Fixing the download dropdown class in app.less so that it doesn't affect bootstrap positioning.
- Removing test div on add new layer (layerInfo).
- Adding pagination controls for ngGrid on layer page.

Note: I'm setting the page size from 25 to 10 temporarily to observe how the paging control functions.
Note: I'm not sure if I should be including the new pagination.js in the core folder and the core.js file, so please let me know.
Question: do we want to include a dropdown for the number of items per page still?

I believe there may be a bug in how the grid items are returned perhaps due to sorting the columns, but I'll have to investigate that further.