Added Psychopy 1.79.01

Sourceforge URL (latest) according to guide downloads windows version.  URL used here functions and DLs mac version. Sorry about the audit warning, let me know if this needs to change.
Add Sage 6.0.

Sage is a free open-source mathematics software system licensed under
the GPL. It combines the power of many existing open-source packages
into a common Python-based interface.
don't use commas in artifact stanzas

- no functional changes in this patch
- preparation for interface change allowing custom
  target links in #2532
tests for #2532

Travis won't like this until/if #2532 is merged.
Added 7zX 1.7.1

Wish I could have used a cleaner DL url, but the official site uses a magnet link (lol).  So, MacUpdate it is.  It works, though!
Merge pull request #2611 from stylerw/sevenzx

Added 7zX 1.7.1
Allow customizing the application symlink
Fixed Texmaker 4.1.1 to allow install

Previous version was unable to install ("symlink source is not there").  Added path relative to folder in zipfile to repair.
Merge pull request #2612 from stylerw/texmakerfixed

Fixed Texmaker 4.1.1 to allow install
Merge pull request #2583 from rolandwalker/no_commas_in_link

don't use commas in artifact stanzas
Merge pull request #2532 from voanhduy1512/symlinked

Allow customizing the application symlink
Merge pull request #2543 from rolandwalker/test_alt_target

tests for #2532 - customizing target symlink
Update processing.app

Processing was updated to 2.1.1 on January 21st, 2014.
doc followup for link :target

Followup for #2532.
Merge pull request #2616 from rolandwalker/doc_target_followup

doc followup for link :target
Update Coda to latest version
Merge pull request #2619 from mAAdhaTTah/coda

Update Coda to latest version
Merge pull request #2614 from theDoug/patch-2

Update processing.app
Tweaked URL to meet standards.

Oh Sourceforge, you so crazy.
Add zip subfolder to contributing.md (squash)

Now that 'Link Details' exists, it's a great place to discuss how to handle subfolders within zip files. "relative path" is unclear in the world of zip folders, as the root isn't clear either, so an example seemed prudent. Seemed better here than in the link discussion.

Squashed from https://github.com/phinze/homebrew-cask/pull/2617