Docs: correct grunt command in README.md

Fixes gh-1850
Dimensions: allow modification of coordinates argument

Fixes gh-1848
Closes gh-1853
Effects: Remove a workaround for a crash bug on some Android 2.3 phones

This reverts the change introduced in:
https://github.com/jquery/jquery/commit/877306738f931a711c41d907e69fc8930f985830