Converted all files to ARC
Merge pull request #35 from keenlabs/19-keenclient-should-use-arc

Converted all files to ARC
Renamed sqlite amalgamation files with keen_io_ prefix, moved header include to KIOEventStore.m from .h
Added class method for SDK Version number retrieval
Merge pull request #37 from keenlabs/29-rename-sqlite-amalgamation-files

Renamed sqlite amalgamation files with keen_io_ prefix
Merge pull request #38 from keenlabs/30-keen-sdk-version-class-method

Added class method for SDK Version number retrieval
Merged previous fixes