Update links to v0.3.1
Add Fedora/RHEL packages to download page

Also fix a few details regarding Ubuntu.
Merge pull request #147 from nalimilan/Fedora

Add Fedora/RHEL packages to download page
Merge pull request #146 from JuliaLang/sf/v0.3.1

[WIP] Update links to v0.3.1
Added my course

Hi ... I added the course I'm teaching this semester and we use Julia as one of the programming tools (the class is going to start next week).
I would also like to see a consistency in writing the course name, so made Prof. Hofmann's course capitalized.
Update index.md
Merge pull request #148 from ashokrol/master

Added my course
Add JuliaBox mailing list link.
Add back link to doi for array14 paper (HT @ihnorton)
Add Gnome screenshot for appdata file
Merge pull request #149 from palango/master

Add Gnome screenshot for appdata file
Update Fedora/EPEL installation instructions

Also improve wording for sentences shared with Ubuntu sections.