Replace spaces in file name with underscores.

This fixes the issue in which a particular instance of Tomcat 6 is
unable to find (yields 404) files with spaces in their name.

Ticket: https://jira.thehyve.nl/browse/UAT-140
:fish:
Merge pull request #48 from thehyve/issues/UAT-140-remove-spaces-in-filename

Remove spaces in filename