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
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.
Fixed opam-admin make to consistently rebuild the archives
+opam archives should be built if any file in the package has been changed, added or removed
(we could exclude changes to the opam and descr files, but do we care ?)
Closes #868, #874, #879 (together with the revert of the temporary fix)
Add .*.swp Vim files to gitignore