advise increasing inotify watcher limit

Dennis Tangrequested to merge
gdk-prepare-linux-inotify-watcher-limit into master

Fixes issue when developing with the GDK on Linux, specifically for front-end, as the build tools need the inotify limits increased in order to watch file changes.

Webpack typically works alright, but I've observed the karma test runner not detect file changes (and therefore not re-run tests).

Closes #307 (closed)

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