Merge pull request #939 from AltGr/release-1.1.0

Release Candidate for 1.1.0
Typo in CHANGES
Fix typos in README
Fix references to old opam.ocamlpro.com in README
Closes #946, thanks for notifying
Re-gen man-pages with new opam repo URL
Merge pull request #948 from AltGr/fix-repo-url-doc

Fixed repo URL in manpages and README
Switch installer script to 1.1.0
Fix Not_found with weird case of pinned package
Merge pull request #949 from AltGr/fix-weird-pin-update

Fix uncaught exception during update with weird case of pinned package
Only accept redirect for http repositories
Fixes #954
Fix: shell init arguments were mixed up
ref: #952
Turning error to warning for malformed packages in repo

Closes #951
Merge pull request #957 from AltGr/refs/heads/repo-error-warning

Turning error to warning for malformed packages in repo
Merge pull request #956 from AltGr/fix-init-shell-mixup

Fix: shell init arguments were mixed up
Merge pull request #955 from AltGr/refs/heads/redirect-http-only

Redirect http only
Add zip archive support
Add an OPAM_CURL env variable to override which curl command is used
Fixing update of dev packages
Closes #961, by reverting the fix to #806 (420401676820894094ef33b22152c5e667453270)
Re-implementing a better fix to #806, delegating the responsability to update the remote URL to
the backend at fetch time. *This is only done for git though*, need to also do it for hg and darcs
Change name to OPAMCURL, use OpamMisc.getenv and add doc
move variable to OpamGlobals