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).

Thanks to Alain Takoudjou <alain.takoudjou@nexedi.com> for his original work on this topic.

Headers are returned as the document json.
Body is returned as the 'enclosure' attachment.

Query extend key_schema to sort_on
querystorage: add schema to use key_schema

Migrate to Dropbox API v2

Root parameter is removed, as it must be now configured on dropbox website itself.

Thanks to Sven Franck <sven.franck@nexedi.com> for his original work on this topic.

Fix getAttachment when blob is undefined

/reviewed-on !74

Add facebook storage.
Keyless queries are case insensitive (like a fulltext search could be).

/reviewed-on !68

/reviewed-on nexedi/jio!66