Updated OpenSRF Javascript client library. Currently, it only implements XMLHttpRequ...

Updated OpenSRF Javascript client library.  Currently, it only implements XMLHttpRequest as
a transport layer, and, thus far, only implements the multipart/x-mixed-replace (server push)
content type, which means only Mozilla browsers are support.

Non-multipart support will be added to support all other browsers in the future -- not much
code involved there.

Most of the existing OpenSRF JS files will be deprecated after the mozilla-based jabber
handling is imported into this new lib.

Currently, all you need is opensrf.js and opensrf_xhr.js to use the lib in xmlhttprequest mode

More work to do....

git-svn-id: svn://svn.open-ils.org/OpenSRF/trunk@1257 9efc2488-bf62-4759-914b-345cdb29e865