Remove progressbar.js dependency from com_finder (admin)

#### Use the bootstrap javascript for rendering the progress bar

`bootstrap.framework` is always loaded in ISIS and HATHOR so it’s better to use that library instead of loading one more script!

#### B/C
The html markup is changed
The relative css file is not loaded anymore
The relative js file is not loaded anymore

#### Testing
To test this make sure you have plenty of data!
Apply the patch with patch tester ( make sure you are on staging)
purge the indexes if there are any
Re index, and observe that the progress bar is still there, working