Compare Runs Specs completed + other changes

Hello Anand,

these are some of the  changes that i made

* added a module to facade the data creation part  

* added some tests to the test_metadatum_spec.rb

* renamed the older compare_runs_spec.rb to compare_runs_spec1.rb (since it actually contained no references to CompareRuns model. I will work next on relocating those tests to the correct location)

* added new specs (model) for compare runs

thanks
Shrikant