Merge pull request #762 from dotcloud/761-packaging-dockerbuilder

Packaging: Ensure dockerbuilder can build docker PPA
Merge pull request #707 from unclejack/411-add-arch-field

411 add architecture field
* Runtime: pass a guaranteed environment to bsdtar for predictable behavior without depending on the underlying host configuration.
Merge pull request #777 from dotcloud/bsdtar-env

Pass a guaranteed environment to bsdtar for predictable behaviour
Remove cgo from term
Use uintptr instead of int for Fd
Remove unused constants
Move Termios struct to os specific file
Spelling correction in docs
Add `make server` command to preview docs
Add Mac OS X instructions for doc tools
Make style consistent
Add more tags
Fix typo
Use em dash in title
Use title case for consistency
Name examples consistently
Use code blocks
Add Node.js web app example using CentOS
Add link at the beginning