add stackoverflow link
add github logo
add slideshare icon
add bitbucket logo
add reddit logo
add meetup logo and link
add irc graphic
add title/tooltips to images
redo company logos as a list

these still need to be styled appropriately
subdue logo colours
make list inline
reorder list of resources

add placeholder for email lists and move items so that
code-related links are up front
fix broken url
add icon for mail-lists
change google plus item
Merge pull request #272 from amirmc/logos

Add logos and links to community page
closes #263