workflows: refactor holding pen widgets

• Adds mini approval widget.

• Removes every hardcoded url in .js files.

• Adds small helper function in maintable.js

• Adds buttons for multiple record approval.

• Adds new row_formatter to format datatables rows.

• Adds checkbox functionality.

• Fixes breadcrumbs in Holding Pen pages.

• Upgrades templates to bootstrap 3.

• Adds a navbar above Holding Pen table and updates layouts across the details page and approval widget page.

• Adds a new tag based UI element for filtering objects in the Holding Pen.

Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>