Merge remote branch 'remotes/manolinux/671_spaces_in_tag_list_edit'

Merge remote branch 'remotes/manolinux/671_spaces_in_tag_list_edit'

* remotes/manolinux/671_spaces_in_tag_list_edit:
  * Feature #678: Drop custom delimiters in tags   * Eliminate the definition of the tag delimiter for tests.   * Remove a test that was related to custom tags delimiter. * Bug #671: Tags list on Edit page is not seperated by spaces and hard to read   * Modify a test to include this space.
  * Bug #671: Tags list on Edit page is not seperated by spaces and hard to read : Make 'media_tags_as_string' function put a space after each comma. * Feature #678: Drop custom delimiters in tags : I declare a constant in the begining of text.py file.