Merge pull request #26 from benhenderson/master

Fixed build error and null reference exception
Removed data rect analysis from Android

Now using the reader the way @micjahn suggests for speed (besides
turning off Auto Rotate).  Stopped using a smaller rectangle of the
preview image for analysis, and for now using the entire image to
analyze.  I think there's a problem with the data rect expecting
portrait and image being landscape.  Also slowed down how often frames
are analyzed so the phone should do less work.  This should help #16 and
also #25
Added options for camera analysis intervals
Fixed Possible Crash scenario for iOS
Merge branch 'master' of https://github.com/Redth/ZXing.Net.Mobile