Grunt package

[ingo]

This is meant to solve what was discussed in #6699. We make it easier to bump versions in titanium_mobile.

To use and test:

1. Bump to next patch: grunt bump:patch (should go to X.Y.Z + 1)
2. Bump to next minor: grunt bump:minor (should go to X.Y + 1.Z)
3. Bump to next major: grunt bump:major (should go to X + 1.Y.Z)

Note that we use grunt-version here over grunt-bump because we need to bump package.json and titanium_version. However, we use the grunt-bump syntax as I believe it is the better long-term plugin and there is a discussion to fix this here: vojtajina/grunt-bump#131

See https://jira.appcelerator.org/browse/TIMOB-18662 as well.

[jonalter]

Looks good!

[ingo]

@jonalter feel free to merge unless you have objections :)

[jhaynie]

yeah

[hansemannn]

Hi @ingo, do you still want this change in? We should update it to work with master and latest node deps before. Thanks!