Merge pull request #28 from keenlabs/27-use-sqlite-amalgamation

SQLite hotfix, queuing and amalgamation
Update README and bump version.
Updated .podspec to include sqlite-amalgamation header files
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
Added convertNSDateToISO8601 method to KIOEventStore to remove dependency on NSDateFormatter
Merged previous fixes
Tweaked sqlite threading
Updated sqlite date conversion method to include Etc/GMT as +
Removed all traces of NSDateFormatter
Added resetPendingEvents to getEvents
Refactored KEEN_LOGGING_ENABLED macro
Merge pull request #40 from keenlabs/31-nsdateformatter-is-not-thread-safe

Refactored NSDate formatting to be thread safe
Fixed call to importFileData in uploadHelper
Merge branch 'master' into 33-keen-logging-enabled-macro-is-misdefined
Merge branch 'master' into 32-non-shared-client-improvements