Remove not yet useful grunt bump

This is cleanup from the branding work.

I prematurely included grunt-bump, but didn't get it operational.  It doesn't do the crucial things we want (our .cordova/hooks/after_prepare/version.js is pretty close), so not useful baggage. This branch removes an operational install, to get rid of the baggage but provide something useful to look back to, if we ever discover we need it.

There is one change left in, to config.xml.template, to have a more up-to-date version number.