Merge pull request #42 from shantanud/2.2

Re-factored code for Atom feed format writer in service so that we can sup...
1. Performance optimization in atom collection parsing.
2. Code refactorization.
3. Added new utility methods in TypeUtils.
Merge pull request #43 from onkar-dhuri/2.2

1. Performance optimization in atom collection parsing.
2. Code refactorization.
3. Added new utility methods in TypeUtils.