Adding grunt-contrib-watch to devDeps
Updating test instructions

Use grunt tasks instead of bash/bat scripts
WIP: karma testing setup for grunt-contrib-watch
Moving old default task to 'build'
Increased devDep version for grunt-karma
WIP: testwatch task

This task should run karma:unit and watch at the same time, triggering
rebuilds of the ng-grid.debug.js file and then triggering unit tests after
that.
testwatch task functions properly

Had to put "background" option outside of the "options" property.
Updating testing docs

Added automated testing documentation; documentation for CI testing