Add first partner and Twitter follow link.

Signed-off-by: Krzysztof Wilczynski <krzysztof.wilczynski@linux.com>
Merge pull request #905 from kwilczynski/2014-warsaw

Add first partner and Twitter follow link.
[warsaw-2014] add links to location and proposals to welcome page
Merge pull request #906 from liku/master

[warsaw-2014] add links to location and proposals to welcome page
Adding a few more sponsors for DoD SV 2014
Merge pull request #907 from mdxp/master

Adding a few more sponsors for DoD SV 2014