cleanup(full): Remove Chromium OS projects that we don't use.

Everything we need for building is in "minilayout" so prune down to that
set. We can always add things back later.

Change-Id: Ic3056c83cfc2b6610282df664cd94d352aa50db5
fix(full): Switch the default remote to coreos.

Change-Id: Ia9f86b1fd13ed4fd2a5d638d8450ec1852cd0d2a
Merge pull request #1 from marineam/mini

Trim down to "minilayout"
add(version.txt): Add initial version metadata file.

This file will be referenced from other repos to determine the current
CoreOS version. This replaces the version shell script in coreos-overlay
as the authoritative source so that the manifest repo is the only place
to update this sort of data.

Change-Id: I5607beb5647810a60007ba552cb81d6dd5cdffc7
Merge pull request #2 from marineam/version

add(version.txt): Add initial version metadata file.
bump(version): Update version from build-0001

Change-Id: I9c21b8158cafde6b184ac966ad1e4bcccb85f46c