port over from other branch and add to global nav
move to /riak
oops
add installation paragraph
add note in five-minute install
add paragraph to downloads page
move install info to separate doc
add riak-admin commands
add riak commands
some other small changes
add link to riaknostic docs
add new commands to index.md
changes in light of @macintux comments
remove reboot command
remove downloads from global nav
add intro section
changes in light of @coderoshi comments
change navbar
arch is undefined in freebsd
Merge pull request #1036 from basho/bugs/lp/navbar-data-types

Fix nav reference to Data Types/modeling