I added support to send agi variables over POST on dynamic url
sources .. This is very usefull when you are dynamically generating
the text using PHP or other similar language ..

I added in the URL configuration a field named "Dynamic AGI Variables"
you insert the variables you want to send separated by a comma, for
example: "agi_callerid,agi_language"
You can also add dynamic variables set by other applications,
like a DTMF input.
The variables are passed over POST to the PHP (or whatever) file
specified in the URL field.

This is very very usefull when combined with some DTMF input or the
"dynroute" module
(http://www.voipsupport.it/pmwiki/pmwiki.php?n=Freepbx.DynamicRouting)
Merge branch 'master' of https://github.com/gabystallo/texttospeech