Pull in all the gems in fetch, don't exclude development and test

Originally we believed we wouldn't need the development and test groups fetched
into vendor/cache. This is no longer true because we're using the development
group to set up the js dependencies for our asset compilation. This commit
removes the exclusion of these groups.

Signed-off-by: Moses Mendoza <moses@puppetlabs.com>
Merge pull request #137 from MosesMendoza/maint/master/vendor_gems_fix

Pull in all the gems in fetch, don't exclude development and test