add icon images for ontology classes.
add integration of logic graph link

- Includes new View-Settings Helper:
  LogicViewhelper
- remove obsolete graphs-partial in
  in logics view-directory.
display graph even if there is only the center.
make self-edges more prominent in graphs

- Edges in graphs which have the same
  source and target need to be displayed
  a little bit differently in order for them
  to be prominent and clickable.
fix small error in edge-graph arc calculation.
move vector graphics into assets directory.
Merge remote-tracking branch 'origin/staging' into augmenting213_ontology_class_icons
include ontology-class icons into fancy links.
center the icon for single ontologies.
use ontology-class icons for ontology title line.
No exception if permission for first user already exists.
Removed extra permission, first user is already owner.
adjust sizes of ontology-class icons

- also remove inline-css for the ontology
  title h2 and use a css-id instead.
make multiple graphlinks on self behave sanely

- If a node has multiple edges on itself,
  the arcs of these edges should not have
  the same values. Instead random numbers
  are used to modify the display of such
  edges.
Merge pull request #266 from ontohub/augmenting213_ontology_class_icons

Ontology class icons; fixes #213.
Merge pull request #265 from ontohub/correcting247_graph_cosmetics

Graph cosmetics; fixed #247.
Updated gems (and testing github-merge-hook deployment).
Merge branch 'staging' into staging.ontohub.org