(docs) Fix glitches noticed while backporting recent revisions to 1.6.x

* In 2.1 and up, the events endpoint is unsorted for v3 and v4.
* v3 doesn't support environments, but one line about them snuck in.
* Accidentally let "certname" (a v4-ism) slip into v3/nodes.
* Fix a busted URL and some glitchy header levels.
Merge pull request #1013 from nfagerlund/jul_2014_docs_revisions_for_stable

(docs) Fix glitches noticed while backporting recent revisions to 1.6.x
(PDB-762) Fix broken export

This pull request fixes a malformed post-assertion in the events-for-report-hash
function that caused exports to fail on unchanged reports. Inserting proper
parentheses made it apparent that a seq, rather than a vector, should be the
expected return type.
Merge pull request #1015 from wkalt/ticket/stable/pdb-762-broken-export

(PDB-762) Fix broken export
(maint) Split out acceptance and unit test gems in a better way

We want to avoid installing all of the unit test gems when running acceptance.
This patch moves rake into its own place so we can use --without test properly.

Signed-off-by: Ken Barber <ken@bob.sh>
(maint) Switch confine for basic test during acc dependency installation

The way we were using confine was wrong, and since this is now more strict
in beaker it was throwing errors in the master smoke tests. This patch
just replaces it for a basic include? on the master platform instead.

Signed-off-by: Ken Barber <ken@bob.sh>
(cherry picked from commit 42f6ddfd1934b887984c381fc080fa883e83abc2)
(docs) Change some old URLs

Some of these files have moved, and others should point to the latest version
instead of a specific version.