[CB-1285] initial commit of jpeg exif header writer
[CB-1285] initial commit static exif formatting data
[CB-1285] fixed ascii data < 4 bytes bug, correctly constructs TIFF header
[CB-1285] reactivated decimal approximation through repeated fractions
[cb-1285] HeaderWriter writes Exif SubIFD in application marker APP1
forgot exifdata header in last commit
[CB-1285] fixed tag offset issue and corrected rational aprox alg
Merge branch 'CB-1246' of github.com:lorinbeer/incubator-cordova-ios into CB-1246

merging remote changes