Add draft of bulleted feature summary

Most list points and some links are from the introduction to the Julia Manual http://docs.julialang.org/en/latest/manual/introduction/
Merge pull request #77 from mlubin/master

use arXiv link
Update download instructions to steer away from julia 0.1.2 on Ubuntu 13.04
Merge pull request #78 from staticfloat/linuxdownloads

Update download instructions to steer away from julia 0.1.2 on Ubuntu
Be more explicit in our warning about Ubuntu
Merge pull request #65 from astrieanna/patch-1

A List of Features for the home page
Changes link in text to point to default version, not latest.

Closes #50.
Add julia.meetup.com
Add 0.3.0-prerelease downloads to the page
Add Triangle users' group
Add missing parens to Triangle Users Group NC
Add julia-deps to release install info on Ubuntu
Julia works on Windows XP SP2
Fix Winston examples link
Merge pull request #84 from magistere/master

Julia works on Windows XP SP2
Merge pull request #83 from magistere/fixlink

Fix Winston examples link
Added MIT 18.330 and Cornell CS 5220 courses
fix formatting errors in teaching page
Added 15.S60 and 15.083
Undoing break to cornell link