Merge pull request #14 from PSPDFKit/rad/update-to-pspdfkit7

Update to PSPDFKit 7.0.0 and Titanium SDK 6.2.2.GA

Update readme

Use Titanium 5.5.1.GA

iOS 5.3.8

PSPDFKit 5.3.4 for iOS

PSPDFKit 5.2.0 for iOS

bump version

Update version to 4.4.13

Update bindings for PSPDFKit 4.4.2

Update for PSPDFKit 4.2.1