Merge pull request #260 from amirmc/redesign

add link to 100lines to front page
Planet: Position better the RSS imgage & add tooltip.
Planet: Try to make the "Read more" buttons lighter.
Planet: decrease the top padding of the RSS image.
add cryptosense to companies page - closes #261
add default image and tweak companies page
rework books page to improve layout and content

resolves #259 by moving and restricting image sizes,
grabbing excerpts where needed and adding
placeholder images when no cover is available.
Merge pull request #262 from amirmc/books

Rearrange books page and tweaks to company page
integrate list of opam recent updates
tweaks to books page
Merge pull request #264 from pw374/redesign

integrate list of opam recent updates
Link event "OCaml 2013" to the proper page on the site.
Add OUD and CUFP on the meeting page.
add stackoverflow link
add github logo
add slideshare icon
add bitbucket logo
add reddit logo
add meetup logo and link
add irc graphic