Silence makeinfo error during `make slime.info'

The error reported was:

  slime.texi:536: @itemx must follow @item
Use correct file name (README.md) in mkdist.sh.
Include contrib/ in distrubution built by mkdist.sh.
Highlight README.md's code snippet as Emacs Lisp.
Send Travis email notifications to slime-cvs
Minor highlighting fix in README.md
Merge pull request #70 from nbtrap/include-contrib-in-mkdist

Include contrib/ in distribution built by mkdist.sh
Merge pull request #69 from nbtrap/fix-info-build

Silence makeinfo error during `make slime.info'
Merge remote-tracking branch 'origin/pr/68'

Conflicts:
	mkdist.sh
Replace .cvsignore with .gitignore