remove some gems that do not make sense for mondo, and add some that do

[jvanderhoof]

Thoughts?

@mrjman @jmyers0022 @mhfen @justinhillsjohnson

[jmyers0022]

Cool. Just need some builder methods for the new gems :)

[jmyers0022]

I'm curious as to whether or not it's worth it to maintain this to keep up with updates to rails and the other gems though.

[jvanderhoof]

@jmyers0022: good call on the version numbers. It's a boilerplate, so it would make a lot more sense to make sure it's running the most recent version of all gems.

[mrjman]

I think this can be fairly opinionated with gems with possibly some ways to skip portions through options. But also most of these are simple enough to just remove the gem once the project is setup if you dont need it.