Update README.md
Added some code-coverage testing to CBLCollateJSON & fixed test holes
Fix for replication never going idle after checkpoint-save conflict

Fixes #128
Updated MYUtilities
Replications created by -replicateWithURL:exclusively: should be continuous
Added Base64 conversion methods to CBLJSON class.

Fixes #129
Support for 64-bit iOS

NOT TESTED YET! But the iOS frameworks now include 64-bit binaries.
A side effect of this is that I had to bump the minimum supported iOS
version from 5.0 to 6.0, which for some reason is a prerequisite for
enabling 64-bit.
Fixes #130
Fix Xcode 4 build by making the 64-bit iOS setting only apply to iOS 7.