Add class AEPriceMatrix
Add link to price matrix to Readme
Add price matrix data in AEPriceMatrix.plist
Add private lazy loading [AEPriceMatrix priceMatrix]
Add private binary search for tier by value
Add public [AEPriceMatrix convert: from: to:]
Add example to Readme
Merge pull request #2 from adjust/conversion

Implement [AEPriceMatrix convert: from: to:]