Get around heroku request timeout

[mattparrilla]

2015-12-07T00:35:20.905081+00:00 app[web.1]: Generating 3D Lake GIFs of Total Phosphorus
2015-12-07T00:35:24.535720+00:00 app[web.1]: Rotating matrix
2015-12-07T00:35:24.543958+00:00 app[web.1]: Increasing dimensions
2015-12-07T00:35:25.605849+00:00 app[web.1]: Normalizing values
2015-12-07T00:35:25.601789+00:00 app[web.1]: Stackining frames
2015-12-07T00:35:26.058644+00:00 app[web.1]: Mapping values to colors
2015-12-07T00:35:50.899373+00:00 heroku[router]: at=error code=H12 desc="Request timeout" method=POST path="/lake-gif" host=lake-brite.herokuapp.com request_id=51bfbbeb-7326-4b6c-8eac-63d511c7e55b fwd="162.247.89.226" dyno=web.1 connect=1ms service=30001ms status=503 bytes=0

https://devcenter.heroku.com/articles/limits#http-timeouts