fix xml dates

They weren't in a valid XML schema format.
added a new, more specific, mime type for PDMP documents

"application/xml" was much too generic, so now documents served in our
GreenCCDA XML formats are identified by the
"application/vnd.mitre.pdmp+xml" mime type.

The docs will still be served if requested by "application/xml" for
the time being but that behavior is deprecated and will be removed
soon.
Merge branch 'master' of ssh://home.caboteria.org/home/tobyc/work/mitre/pdmp/pdmp-spike
Revert "add headers to allow cross-origin sharing"

This reverts commit acae7c7e47fc9d7055a98c1f913ce89fd099c3f8.  We
needed these headers to help debug the initial integration but they're
no longer useful.
remove "application/xml" MIME type for green PDMP documents

It has been superceded by "application/vnd.mitre.pdmp+xml" which is
more specific.
upgrade Rails to 3.2.12
add a set of revision 2 XML schemas
add a new mime type for the revision 2 xml
add links to revision 2 xml representations to the hData atom feed
modify patient and record schemas to DRY

patient and record both defined a "record" element, so patient
documents now use patientInformation as a document element.  this
allows us to include patient.2.xsd into record.2.xsd.
add views for revision 2 xml representations
remove containing <medications> element in full CCDA report

Now the report consists of one <patientInformation> and then 0..n <medicationOrder>.
update tests to request r2 documents
fix some misleading wording in the srpp spec

When I changed from 3 sections to 1 I didn't fix all of the wording,
so that left some text that was ambiguous.
update the srpp spec to r2
Merge branch 'r2_schema'