Fixed wrong mode of gif image.
In case of L mode and small image.
Updated Changes.rst [ci skip]

formatting
Remove a rogue "=" from the end of a line

It wasn't there in the original PIL handbook: http://effbot.org/imagingbook/format-jpeg.htm

[CI skip]
No need to time now Travis has time tags

http://blog.travis-ci.com/2014-08-13-per-command-time-tags
Fix typo
Link to CHANGES from README

And use absolute URLs for GitHub links so they work from PyPI.

[CI skip]
Remove 2,505-line changelog from description

It made the PyPI listing page very long and requires a lot of scrolling to get down to the files, annoying for downstream packagers.

Instead it's linked from the README. 

[CI skip]
Added test case for gif image (mode L): optimization turned on, but not needed.
Fixed test_optimize_full_l gif file test case.
Fixed test_optimize_full_l test case for python2.
Merge pull request #854 from hugovk/changelog

Link to 2,505-line changelog instead of showing it all on PyPI
Fix MANIFEST

include *.md
recursive-include Scripts *.sh
recursive-include Tests *.bw
recursive-include Tests *.cur
recursive-include Tests *.dcx
recursive-include Tests *.mpo
recursive-include Tests *.ras
recursive-include Tests *.rgb
recursive-include Tests *.sgi
Merge pull request #843 from uvNikita/gif_mode_fix

Fixed wrong mode of gif image.