Incorporate build in ci

[rexagod]

Fixes #196 --> https://travis-ci.org/publiclab/PublicLab.Editor/jobs/475590529#

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[jywarren]

Oh cool! Can you demonstrate that it breaks the Travis build if grunt build fails? Maybe... by removing one of the npm packages that build depends on? (we can revert the commit once demonstrated, just want to be sure!)

Thanks so much, this is great!

[rexagod]

@jywarren Sure, although the current travis configuration fails if build does (as is shown here), I did notice there was a chance to refactor the yml and went with it instead, hence making some the necessary changes.

Normal run: https://travis-ci.org/publiclab/PublicLab.Editor/builds/476030956
Failed run after grunt-browserify was removed: https://travis-ci.org/publiclab/PublicLab.Editor/builds/476031041

[jywarren]

Local Npm module "grunt-browserify" not found. Is it installed?

Awesome. Merging this! Would you be interested in adding this to a number of our other JS repositories? These could all use it; we could mention this in the weekly Check-In to recommend others make this change if you don't want to do all yourself?

• https://github.com/publiclab/leaflet-blurred-location/
• https://github.com/publiclab/leaflet-blurred-location-display/
• https://github.com/publiclab/image-sequencer/
• https://github.com/publiclab/Leaflet.DistortableImage
• https://github.com/publiclab/infragram/
• https://github.com/publiclab/spectral-workbench.js/
• https://github.com/publiclab/inline-markdown-editor/

[rexagod]

Sure! I'll do it.