Split stdout stderr for non-tty commands
Add stderr unit test
Make StdCopy works with huge amount of data
Add documentation
Replace deprecated upgrading reference to docker-latest.tgz, which hasn't been updated since 0.5.3
Update Gentoo installation documentation now that we're in the portage tree proper

We're officially a first-class Gentoo citizen now, which is very exciting.  Many thanks to @gregkh for helping us get here.

I started just adapting sections of language in this document, and realized several bits needed to just be rewritten entirely to be more clear.
fix the error message so it is the same as the regex issue #1999
Merge pull request #2004 from kencochrane/master

fix the error message so it is the same as the regex issue #1999
Merge pull request #2001 from tianon/gentoo-tree

Update Gentoo installation documentation now that we're in the portage tree proper
Merge pull request #2000 from tianon/deprecated-docker-latest-tgz

Replace deprecated upgrading reference to docker-latest.tgz, which hasn't been updated since 0.5.3
Update docs + fix endian issue
Merge pull request #1842 from dotcloud/split_stdout_stderr

* Runtime: Split stdout stderr