global: asset building in dev mode
global: asset building in dev mode

* Re-enables asset building when setting up the developer mode. There
  does not seem to be any good reason to disable this.

Signed-off-by: Marco Neumann <3829486b93ec44395f0b980424bae9b6fb07b7bc@crepererum.net>

tiborsimko/invenio,inveniosoftware/invenio,inveniosoftware/invenio,tiborsimko/invenio