OO-1343: add three different style choices to catalog, refactor the catalog admin, refactor the image pipeline of the catalog to reduce the number of scaling

	OO-1253: not assessable nodes and not published nodes return a score of 0.0 instead of the large negative number. If not assessed, no score seems logic but not a large negative value

OO-1342: refactor the loading mechanism for the custom media controller with a standard factory pattern

OO-1341; make the extension of the image mandatory, needed by the java scaling service to discover the type of the image

- fixed a silly use of Autowired
- added missing wording

OO-1328: update to bootstrap 3.3.1, fix issues with our modal dialogs (spinner and popup) and bootstrap 3.3.1