add file size limit to diff
use correct file size limit
Merge branch 'staging' into 570-diff_size_limit

Conflicts:
	app/views/files/diff.html.haml
	lib/git_repository/get_diff.rb
fix errors after merging
do not rely on angle brackets anymore to ident uri

Hets does not use angle brackets anymore, so we do not
either. Now we try to determine for ourselves
if the supplied name (usually comes from the name
attribute of a DGNode in hets xml output) is a url
and if we should convert it to a, more readable,
name.
replace underscore with space for name-generation

This changes switches up two things:

- We do not group the delimiter-chars anymore, which
  results in the fact, that they aren't part of the result
  set (so: underscores are gone).
- We join the different words (after capitalizing them) back
  together with a space-delimiter.
search for correct names in seeds

This 'reverts' c10e24673c269144c8d29d1b8fd5c3b580552fe4.
add spec for naming ontologies.
Increase minimal hets version (for URI without angle brackets).
Merge branch '570-diff_size_limit' into staging
Merge branch 'staging' into develop