freeswitch: immediately end the script if configure for makefiles fails
freeswitch: use the stable branch

Easier if it's pegged at a known stable version instead of
using master all the time and unknowingly using different versions
on different machines.
freeswitch: change FS_GIT_REPO to stash.freeswitch.org

Seems like the old URL is dead.
Merge pull request #125 from darylyu/fs_install_fixes

freeswitch: small fixes
freeswitch: add debian init scripts during install
freeswitch: use the installation path in the init script

The Freeswitch code from the original repository assumes
that it was installed via apt which means that the binary
is in /usr/bin and the configuration is in /etc.

This change uses Plivo's Freeswitch directory
instead: /usr/local/freeswitch

WARNING! I set WORKDIR for start-stop-daemon to $FS_INSTALLED_PATH,
because I don't know what it's supposed to be. The one that ships
with Ubuntu assumes it's in ~freeswitch(/var/lib/freeswitch).
fix clone and other stuff. you really should do a fixup