The target development platform has changed to Ubuntu 14.04 [1].
This patch makes the suggested SAIO platform the same.
Also, remove pointer to wiki page for other platform install
instructions that either redirects back to this SAIO doc or
to another wike page and then a dead link.
[1] I0a96bcf692bb240f3ab5aab7fefd294a07735a83
DocImpact
Change-Id: I9f96104b5437c1f1f28f924c048ef83cf03338f4