module/tm: changed log level from WARN to DBG for informational message
cfgutils: init probability pointer to NULL

- otherwise it can be an attempt to free it when the kamailio does not
  start due to config errors
- reported by Dragos Oancea
mohqueue: fixes

* cleaned up all error paths (fixed crashes)
* added support for INVITEs that get stuck
* adjusted code to avoid compiler warnings
* PRACK only invoked if Require: 100rel set
* fixed bug that allowed a new call to be created more than once

Documentation
* updated NOTES
modules/ims_charging: corrected default termination cause code to DIAMETER_LOGOUT
	- also corrected typo
	- added other termination cause code defines for future use
Merge branch 'master' of ssh://git.sip-router.org/sip-router
modules/ims_charging: fixed bug not initialise AVP string value for success CCA
modules/ims_charging: restored an unlock that will cause deadlock if omitted
ims_charging: fixed bug causing dialog cb function to be called more than once

- removed possible race condition in dialog cb
- improved the way locking was performed
ims_charging: Merge branch 'ims_charging' into master
parser: defined new FL_RPL_SUSPENDED used for suspend on reply
modules/tm: extended tm async support to SIP responses
	-t_suspend and t_continue functions now work with SIP responses as well as requests
modules/tm: Edited documentation to show that t_suspend/continue can now be used on SIP responses
modules/ims_qos: second iteration of ims_qos module
	- module now support media authorization over Diameter Rx (between P-CSCF and PCRF)
Makefile.defs: version set to 4.1.0-pre0
modules/ims_registrar_scscf: added outstanding documentation
fix dns srv failover when no UDP record is present

- refactored code for srv lookup to have less code duplication
pkg/kamailio/centos: updated documentation
pkg/kamailio/centos: removed out-of-date BoxGrinder appliance files
pkg/kamailio/centos: updated rel in .spec
pkg/kamailio/centos: updated .spec to build packages with dependencies that can be met by EPEL

- This means the computer building the RPMs needs to have access to EPEL and
  the appropriate dependencies installed from it.  However, there will be
  no need to have EPEL dependencies installed on a running instance _unless_
  you want to use one of the modules with an EPEL dependency.
- The modules supported with EPEL are:
  - acc_radius, auth_radius, misc_radius, peering
  - carrierroute
  - dnssec
  - geoip
  - json, jsonrpc-c
  - ndb_redis