add separate cytoscape.js component; update PsicquicGraph & InteractionsFilterGraph to use cytoscape.js latest
Allow multiple Sequence components on the same page.

closes #14
fix determination of mouseover/mousedown position
Merge pull request #27 from cytoscape/master

Add Cytoscape.js component; update components that use Cytoscape.js to use latest version

I tested the following components:
``` 
InteractionsFilterGraph 
PsicquicGraph
 ```

Both seem to be working fine.
Merge pull request #28 from ilia-kats/master

Allow multiple Sequence components on the same page.
Tested. Seems to be working
Merge branch 'master' of github.com:biojs/biojs