base/deposit: initial release of feedback

NOTE: Introduces new JS library
  <https://github.com/giokokos/feedback.js>

Signed-off-by: Georgios Kokosioulis <georgios.kokosioulis@cern.ch>
base: feedback bundled on every page

* Adds `inspire_base_init.js` to trigger the Feedback form.

* Changes the bower to use:
    <https://github.com/inspirehep/feedback.js>

Signed-off-by: Georgios Kokosioulis <georgios.kokosioulis@cern.ch>
Co-authored-by: Javier Martin Montull <javier.martin.montull@cern.ch>
deposit: handler to create feedback email

Signed-off-by: Javier Martin Montull <javier.martin.montull@cern.ch>