added context manager support
Read test for 16 bit binary pgm file, #602
Read support for 16 bit pgm file
Tests for writing hi bit pgm
Write support, fixes #602
consistency
sanity check on ascii integers
Fix failing tests, turns out I is different than L
Merge from master
Rename import_err to something more general
Use the deferred error to provide a logical exception on access to a closed image
Add specific 32-bit float tiff format

We regularly use this format to store 32bit floats and I would like to see it handled by clean Pillow installations without having to add it on every system I use.
Test image: TIFF for OPEN_INFO = {(II, 0, 3, 1, (32,), ()): ("F", "F;32F")}
Fix spelling errors in documentation

https://pillow.readthedocs.org/en/latest/about.html
Update installation instructions of little cms2 in Mac
Merge branch 'patch-1' of https://github.com/Hijackal/Pillow into Hijackal-patch-1
Merge pull request #620 from myint/master

Fix spelling errors in documentation
Merge pull request #621 from e98cuenc/fixlcmsdoc

Update installation instructions of little cms2 in Mac
Tests for #614
Merge pull request #614 from Hijackal/patch-1

Add specific 32-bit float tiff format