Remove Linux-only OS restrictions

Created by: awaidmann

Previously, OS was restricted to only linux. However cytoscape.js does not appear to have any os restrictions defined in it's package.json. Addresses issue #1 (closed).

I have tested it on my OSX 10.11.5 machine, npm v3.3.12, node v5.4.0, tsc (typescript compiler) v2.1.5. All previous Cannot find name 'cytoscape' errors have disappeared.