bug fix, deleted some stuff associated with 'crosslink-viewer' from Polymer.js
click-drag on link moves all interactions that participate in that interaction
small molecules identified by checking interactor.type, couple of bug fixes
took reference to mailing list out of README.md
Merge pull request #4 from MICommunity/master

Merge colin-combe/master
Merge pull request #2 from colin-combe/master

Merge some changes from colin-combe/interaction-viewer