Add Qt5 support.
Add Qt5 support.
Fix PyQt4&5 support.
Update installation.rst

libtiff4-dev is obsolete
add ico save support
add tests and docs
Merge remote-tracking branch 'upstream/master'

Conflicts:
	PIL/ImageQt.py
Fix bad importÃ
Merge pull request #1003 from AurelienBallier/master

Use PyQt4 if already imported
Update CHANGES.rst [ci skip]
Merge pull request #989 from thegeorgeous/patch-1

Update installation.rst [ci skip]
More tests for ico save
Merge pull request #1007 from wiredfool/ico_save

Ico save, additional tests
Update CHANGES.rst [CI skip]
Merge branch 'master' of https://github.com/python-pillow/Pillow