Better documentation of :checksum and :checkout properties

* Explain the difference between :checkout and :checksum
* Document that hg method now supports these properties
document 719264d (even though it isn't merged yet)
Document that checksums may not be abbreviated

As requested in #626.
In hg, "checkout" is properly spelled "update"
methods/el-get-github: change the default url type to https

All git repositories should be fetched over HTTPS by default, to allow
authenticated pushes to the user's own repositories.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Added pythonbrew-mini
w3m-extension depends on w3m and basic-edit-toolkit
Minimap has been moved to ELPA
Recipe for flycheck-color-mode-line
Merge pull request #1536 from dholm/bugfix/w3m-extension

w3m-extension depends on w3m and basic-edit-toolkit
Merge pull request #1538 from dholm/recipe/flycheck-color-mode-line

Recipe for flycheck-color-mode-line
basic-edit-toolkit recipe
Merge pull request #1537 from dholm/bugfix/minimap

Minimap has been moved to ELPA
Merge pull request #1539 from dholm/recipe/basic-edit-toolkit

basic-edit-toolkit recipe
helm-cmd-t recipe
Merge pull request #1540 from dholm/recipe/helm-cmd-t

helm-cmd-t recipe
ltx-help recipe
Merge pull request #1541 from dholm/recipe/ltx-help

ltx-help recipe
keychain-environment recipe
Merge pull request #1542 from kopiczko/master

keychain-environment recipe