two additional tags for saving color images with libtiff
packbits isn't working correctly
error test for bw compression on RGB file
CHECK: support for int arrays as ifd entries
Renamed test tiff files to 16bit*. They are 12bit data in a 16bit format
Tests for 12bit tiff rawmode
Read only implementation of 12bit tiffs
Comments

Fixes #414
Add Qt5 support.
tests for imageqt4/5
Fix for failing ImageQt with mode 'L' image
Qt5 Documentation
removed debugging prints
testing pyqt4 on travis
Merge from master
Skip ghostscript test when it's not executable
12 bit tiffs come out as 12 bits from libtiff
Removing unused, redundant compression variable. Actual compression setting is in the imagefiledirectory
added generic libtiff en/decoder instead of each compression version
Flags to force libtiff read/write