MIN is an aggregate function on MySQL

Closes: FS-5218 (Thanks to Nathan Neulinger for the patch)
examples for the ext-voicemail and ext-redial options to mod_skinny sample conf

Closes: FS-5227 (Thanks to Nathan Neulinger for the patch)
mod_skinny parses and modifies odbc url, breaking it, but also doesn't use the resulting vars

Closes: FS-5224 (Thanks to Nathan Neulinger for the patch)
Fix in-band ringback in mod_skinny
Closes: FS-4241 (Thanks to Marek Wiewiorski for the patch)
FS-5223
FS-5226 --resolve
add execute_on_pre_bridge and execute_on_post_bridge vars to behave like the other family of execute_on and not break the existing pre bridge vars that are now depricated
change ready to up in this case
FS-5221 --resolve set NOSIGNAL on http_get
Merge branch 'master' of git://github.com/FreeSWITCH/FreeSWITCH
mod_rayo: workaround displace w/o mux bug
mod_rayo: improve rayo client logging
Merge branch 'master' of github.com:grasshoppergroup/FreeSWITCH-rayo