Remove fsevents from node_modules

The most recent travis deploy failed. This should fix that. The issue was that Karma includes a dependency chokidar, which has an optional dependency fsevents. fsevents is a mac thing, but since I built on a mac it was created and therefore failed on linux. I removed it and added fsevents to gitignore so hopefully this won't be an issue in the future.

More info at https://github.com/paulmillr/chokidar/issues/114