simple test framework

very basic, but might be good for initially verifying our tests.

keep in mind the following directory structure required:
```
EmptyClassStory:
autogen/	expected/ 	models/

EmptyClassStory/autogen:
Class1.rb  Class2.rb

EmptyClassStory/expected:
Class1Expected.rb	Class2Expected.rb
```

Example output:
```
jongill@Jon-Gills-MacBook-Pro:uml2ruby/acceleo/test/SimpleRegression> ruby regression.rb
[EmptyClassStory]
  [+] Class1.rb == Class1Expected.rb
  [+] Class2.rb == Class2Expected.rb

[*] 1/1 tests succeeded.
```