Code Refactoring.
Removed unused constructor.
Got rid of unnecessary method argument.
Fixed date & decimal parsing.
Removed partial code
Merge pull request #40 from onkar-dhuri/2.2

Code Refactoring.
Code refactoring and partial feature implementation -
1. Implementaed factory pattern to return feed parser depending on type of format. (atom/json)
2. Added MediaTypes corresponding to Json representation.
3. Changed FormatParser interface to support Factory Pattern for json/verbose/atom feed parsers.
4. Added API in Query to retrive parameters added in queryString.
5. FormatType enum to represent atom/json response types.
Merge pull request #41 from onkar-dhuri/2.2

Code refactoring and partial feature implementation -
Refatored code for Atom feed format writer in service so that we can support the Json format implementation.