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"
Fixed installation of tomorrow-theme.
Use expand-file-name rather than explicit concat.
Fix typo , by adding " " to :pkgname
Added pythonbrew-mini
Recipe for ag.el.
Fixed Doxymacs not building on osx
Fixed Evil not building on osx
Adds a sed line that allows to build slime.info with makeinfo v. 5.X
Projectile depends on pkg-info and fails if not installed.
Recipe for grizzl.
Modify `ibuffer-vc` recipe to point to github instead of elpa
Install `wgrep` from github

...Instead of auto-generating the recipe from emacswiki
Fix `ac-nrepl.rcp` to point to clojure-emacs
Merge pull request #1442 from vedang/fix-ac-nrepl-recipe

Fix `ac-nrepl.rcp` to point to clojure-emacs
Merge pull request #1441 from vedang/add-wgrep-recipe

Install `wgrep` from github
Merge pull request #1440 from vedang/modify-ibuffer-vc-recipe

Modify `ibuffer-vc` recipe to point to github instead of elpa