Update to xmlsh 1.2.3

Update to xmlsh 

I recently pushed an update to xmlsh (v 1.2.3) and  all dependant extension modules.

Full release notes are here: (for the core)

http://www.xmlsh.org/ReleaseNotes123

Just some random notes on improvements

• New RANDOM32 and RANDOM64 variables
• Improved http command by switching to Apache httpclient
• MUCH better JSON support (to be documented)
• A log window for xmlshui makes using it as a debugger much easier
• Improvemetns to xurl and urlencode so that you can create safe URL's much easier by passing in all the components of a URL and query as separate strings. - Critical for creating complex REST calls.
• various bug fixes

In addition to core, some enhancements to aws, marklogic, and twitter extensions.