updated the comments
Improved Restler,

- Fixed the postCall
- Removed the unused `apiMethod` property. we shall use `apiMethodInfo->methodName` instead
- Changed access of `composeHeaders` method to public
Improved Resources. When in production mode resources.json shall be cached
Improved Resources. When in production mode individual resources shall be cached
Improved Restler, changed the format of pre and post calls

to pre_{method}_{format} and post_{method}_{format} respectively for better clarity.
Updated Resources to use the new pre and post call format. Closes #193