Update README.md

I found it not obvious.
fixed a bug in geo reversing Google Map search result to Apple's CLPlaceMark
Merge pull request #1 from matteprl/patch-1

Update README.md
Merge pull request #2 from bpoplauschi/countryCode

Added countryCode support so the results can be filtered by country
this is embarrassing ...
fixed compile warning on 64 bits devices: Values of type 'NSUInteger' should not be used as format arguments; add an explicit cast to 'unsigned long' instead
enabled Build Active Architecture Only for the Debug configuration and improve build times by skipping unused architectures.
just followed whatever new Xcode prompted...
Merge pull request #1 from chenyuan/master

Catchup on chenyuan branch