Added additional testing, fixed attachment methods, incorporated Romain's comments, and added more comments and simplified code structure.

Implemented attachment methods so that scenario_officejs.js runs with historystorage as the local sub storage.

Get and allDocs can now be used to access older revisions without changes to the API.  The approach to doing this with allDocs is very costly right now, but is being fixed for the next commit.

allDocs method is updated to allow an options.revision_limit parameter which allows queries on older revisions of documents.

Implemented absolute, consistent, and leaves style getting of old revisions of documents and one large test case with three users to validate these methods.

Added functionality to .get which allows the user to step backward through the absolute revision history of a document, as well as the branch of revisions which have produced the latest form.

Implemented the method of storing every operation done to each document  instead of the documents explicitely.  The tests which do not pass are labelled NOT IMPLEMENTED due to current limitations on the ability to query sub-attributes of documents.

Revised bryanstorage so that a log of puts and removes is recorded.  All tests involving getting, putting, removing, and querying from other storages are passing.  Currently, the allDocs method is not implemented correctly, but there are several placeholder tests written which demonstrate the desired functionality.

Tests are not passing, but no longer having error with options passed to QueryStorage.buildQuery as undefined.

bryanstorage now uses querystorage and uuidstorage as substorages to implement uuid posting and querying the sub storage.

Updated bryanstorage to retain all versions of documents and only retrieve the most recent copy when get(id) is called.

Added _ parameter to metadata of bryanstorage documents, which increments each time put, putAttachment, or removeAttachment is called on the document.  Created tests to test these features.

Added src/jio.storage/bryanstorage.js and test/jio.storage/bryanstorage.tests.js for revision storage implementation.

/reviewed-on !83

Update Moment
Fixs on queries sorting

/reviewed-on nexedi/jio!81

Add support for ERP5's selection_dmain

jIO.util.stringify({y: null}) used to error. Now it behaves similarly
to JSON.stringify, returning '{"y":null}'.

/reviewed-on nexedi/jio!80

Add HTTPStorage and ParserStorage (RSS/OPML).