fix overwrites EXPOSE
add regression test from @crosbymichael
add container=lxc in default env
fix error message when invalid directory
Merge pull request #1244 from dotcloud/1020_add_variable

*Runtime: Add container=lxc in default env
fix test env
Merge pull request #1264 from dotcloud/fix_tests_env

fix test env
Merge pull request #1236 from dotcloud/1234_overwrites_expose-fix

*Builder: fix overwrites EXPOSE
Merge pull request #1262 from dotcloud/1253_add_directory_check

* Runtime: fix error message when invalid directory
Allocate a /16 IP range by default, with fallback to /24. Try a total of 12 ranges instead of 3.
Merge pull request #1265 from dotcloud/better-bridge-defaults

*Network: Improve default network configuration
Hack: first draft of the maintainer boot camp. Work in progress!
Hack: completed step 12 of the bootcamp
Typo in 3rd-party
Added new docker logo to the documentation header, and added other links.
Merge pull request #1269 from dhrp/new-website-links

Added new docker logo to the documentation header, and added other links to docs header. Tnx @keeb !