css and js final touches

- show message about the ability to zoom
- fix css problems (graph height and other)
- add link to odnb full entry (put that one first, before the other two
links)
- About tab --> © 2014, change to landing page description
- when contribute, provide visible feedback of submission done and
google link
- make all circle sizes the same except for person you searched
- change reducing network to double click
edited zoom feature
fixed zoom
Merge pull request #25 from sdfb/final-touches

css and js final touches