makes the documentation a whole lot easier, and since
we only need to support one command, this is actually more readable

so the default thor help generated is nicer
also, AweSim::Rails should not conflict or confuse
with AwesimRails gem or other

but we might consider placing this in a submodule just to be safe...

`awesim rails new` is a wrapper/proxy around `rails new` so we exec after
setting up the command

uses application template stored on gpfs. it works, but
using backticks doesn't print any output till the end, which sucks.
rather, would be nice to pipe it through so you see continuous output.

Better to just document how to create a new app - developers won't do this
every day. We can make this process better later :-(

add defaults, merge with provided hash, but use default if a hash value
is  nil

split up validation of Apps into three separate concerns:

1. is it a valid dir name?
2. does the user have rx to it?
3. is there a manifest for it the user can read?

for the factory methods return all apps where 1 and 2 or 1 and 3 are true

This reverts commit 9dabf9df.

its crazy that the unit test didn't pick this up
but if you don't require yaml then it isn't found
but the unit tests ran successfully without having that
require statement...