Update ZXCapture.m

Changed from 'assign' to 'strong' to fix problem where we're assigning retained object to unsafe and unretained variable.
Update ZXPDF417HighLevelEncoder.m

fix bug: if continuous digit count is greater than thirteen, encode will failure, result cannot be decode again.
Update ZXAztecWriter.m

fit output image size to input width & height
Separate unit and blackbox tests into different targets

By default both sets of tests will still run, but this makes it easier
to run just one set of tests.
Fixed possible crashes when Modal ViewControler conforms to ZXCaptureDelegate.
Version bump: 2.2.3
Fix project file
Update OS X Unit Tests name
Specify 64-bit iOS support in the project file
Cast possibly ambiguous invocations of 'count'. Fixes #113
Update project file and schemes for Xcode 5
Parallelised luminance conversion routine and also converted floating point to integer math. Difference in result from FP math is on average less than 1 level. Decent performance boost =)
Revert the "un-premultiplying" code
Correct RSSExpandedStackedInternalTestCase target for OS X
Removing separate test target for blackbox tests

Unfortunately multiple test targets don't seem to work when testing on
the simulator. I get the error "The Simulator can't be launched because
it is already in use."
Make static variable initialization thread-safe.
Port fix for handling start and stop characters
Finish port of r2820 from ZXing
Ported r2821 from ZXing
Reference local variables and not ivars