Colors: document use of OPAMCOLOR

This patch also updates all the (generated) documentation.
Revert "Colors: document use of OPAMCOLOR"

This reverts commit 78cd6f61fb70161ee70a4a3bcb920dcbbeac6d96.
Colors: document use of OPAMCOLOR
OpamFile.Repo, OpamPath.Repository.repo, and HTTP backend now aware of repo metadata file
Local backend now aware of repo file; corrected version file update
Add Travis CI scripts
remove unused var
Merge pull request #877 from avsm/travis

Add Travis CI scripts
travis: add configure steps for Travis
Merge branch 'master' of github.com:OCamlPro/opam into travis
travis: tweak tests target
travis: make tests at the end
add more tests, but redirect output due to Travis output limit (4MB)
travis: exit on error
travis: configure git user
Merge pull request #878 from avsm/travis

more travis fixes
A few copyright and license fixes
Note: text of the LGPL is an addendum to the GPL, so included the text of the GPL in the LICENSE file
Merge pull request #881 from AltGr/fix-lgpl-headers

A few copyright and license fixes Note: text of the LGPL is an addendum to the GPL, so included the text of the GPL in the LICENSE file
Merge pull request #873 from raphael-proust/master

color environment doc
Revert "Fixed .install for cached packages"

This reverts commit 648a82feead2cfbad36810c842649eb5beef8afb.