Update mix docs
Update crash-course.markdown
Update crash-course.markdown
Change rdiscount for redcarpet
Use "fenced blocks" on code

Instead of {% highlight erlang %} use ```erlang ```

And use iex to command line stuff
Update docs
Merge pull request #132 from edgurgel/syntax-highlighting

Syntax highlighting
Merge pull request #131 from edgurgel/patch-1

Update crash-course.markdown
Talk about the capture operator
Fix minor syntax error introduced on #132
Merge pull request #134 from edgurgel/fix-crash-course-hightlighting

Fix minor syntax error introduced on #132
Update umbrella docs for 0.10.1