Experiment with platform specific live-reloading

[diegonetto]

This poses some unique challenges but is theoretically possible.

We could add a grunt serve:<platform> task that builds the platform's Cordova assets but also spins up a connect server and injects the livereload snippet.

Some considerations will need to be made to the current workflow since we are using the www/ directory for built assets and then having the cordova:build task work its magic and publish to the correct platform/ directories.

For this to possibly work we would need a separate workflow that would put un-minified assets into the www/ directory, and re-run cordova:build as watched files changed.

There would have to be a new (dynamic) watch task looking at platform specific files.

[diegonetto]

Looks like a recent update to the ionic-cli added support for this - http://ionicframework.com/blog/live-reload-all-things-ionic-cli/

Instead of duplicating functionality (adding tasks that inject scripts which communicate with the livereload server), I propose exploring a build system refactor that would use the ionic-cli under the hood, so that users get the best of both worlds.

[diegonetto]

Opened #112