Merge pull request #3 from digitaltom/master

Allow common parameters to be overwritten by custom ones
Use expedia’s new development server when making test calls with cid = 55505
Merge pull request #4 from BenjaminCorey/master

Use expedia’s new development server when making test calls
No need for string interpolation + Stub cid for the DEVELOPMENT_SERVER test
Updated [ReadMe + Some comments]
Added rails generator and deprecated rake task
Updated ReadMe