Request generation refactoring

refactored the way default parameters get added
needs support from AFNetworking though...

other misc todos and cleanups
API responses using links
Removing JSON keys

This is not what this library does
Comments about caching
A few property mapper issues resolved
adding image strings / fixed issue with rank and NSNumber
Notes update
Notes
adding image properties using categories / all properties are readonly now

finally cracked it! With this I can easily add sets of ivars that are reused in various places. nice!
LFMTag introduction

with refactoring where its used

also renaming all properties from lastFmPage to lfmPage
and fixing a bug with bioFormationYears
Adding the ImagesSmallToMega Category and refactoring
removing done todos