FTP: Redirect error to higher layer.

* Changes behavior of download function in ftp_utils.py. It was
  silencing the download error, now it is redirected to a higher
  layer.

Contrast_out: Change printed messages.
Merge branch 'master' of github.com:inspirehep/harvesting-kit

Conflicts:
	harvestingkit/ftp_utils.py
Merge pull request #58 from Dziolas/master

FTP: Redirect error to higher layer.
global: more tests added

Signed-off-by: Georgios Papoutsakis <georgios.papoutsakis@cern.ch>
utils: collapse_initials fix

* Fix to handle more than one spaces between initials.

Signed-of-by: Georgios Papoutsakis <georgios.papoutsakis@cern.ch>