added context manager support
Add coverage report
Omit library modules from coverage
Only measure coverage of code in the PIL directory, but includes all those files, even those unexecuted
Include PIL/*.py for coverage to see if it includes unexecuted code
Re-enable notifications
Add pep8 and pyflakes reports to Travis CI
Merge pull request #601 from wiredfool/gs-test

Fix failing test when ghostscript is not installed.
Fix variable name

Wrong variable name was used for transparency manipulations.
Merge pull request #594 from hugovk/master

Add coverage reports for Python code on Travis CI
Merge pull request #604 from nijel/patch-1

Fix variable name
Add history
Add the suffix if it's not there, not if it is
Have the tempfile use a suffix with a dot
Merge pull request #605 from wiredfool/dump

Dump
Add history
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