Moved the static website html pages to their own folder under docs.

This should make previewing documentation easier.
Also updated the Makefile to now copy the theme dir into the _build/website/ dir. Make connect and Make push work.

* Registry: Improve checksum

- Makefile: Swap "go get" for "go get -d", especially to compile on go1.1rc

- Documentation: CSS fix for docker documentation to make REST API docs look better.

- Images: fix ByParent function

* Runtime: kernel version - don't show the dash if flavor is empty

- Builder: Check the command existance prior create and add Unit tests for the case

- Registry: Fix pull for official images with specific tag

- Documentation: Fixed CouchDB example page header mistake

* Documentation: updated www.docker.io website. 

+ Registry: Add docker search top level command in order to search a repository

- Documentation: fixed README formatting

* Builder: use any whitespaces instead of tabs

+ Builder: Implement ENV within docker builder

+ images: output graph of images to dot (graphviz)

Updated index to reflect new (short) 'engine' message (merged with solomon's new text), also moved around the layout a bit and fixed some small text errors.

* Packaging: packaging ubuntu; issue #510: Use goland-stable PPA package to build docker