Added db_cassandra packaging
ims_*_pcscf: Several bugfixes
ims: Updated example configurations

Enhancements:
- Added Ro to the S-CSCF
- Added database support, optionally use db_cluster
- Replaced RTPProxy with RTPEngine module, support for originating WebRTC on the Proxy-CSCF (with SRTP Breaking)
- Optionally engage a SBC between the P-CSCF and the Core, SEMS sample configuration
- smaller adjustments
ndb_mongodb: new module offering a non-db connector to MongoDB from config file
Makefile.groups: ndb_mongodb added to mongodb modules group
usrloc: new parameter db_raw_fetch_type

- specify what type of query should be used in DB-only mode for
  retrieving contacts for specific needs (e.g., sending NAT keepalives)
core: fix execution of callbacks list for net_data_in
topoh: allow server ip to be used as mask ip
topoh: documentation updated for mask_ip parameter
modules:sipcapture  fixed sql schema to version 4. Added optimized partrotation script.
ims_registrar_pcscf: Add option to ignore "REGISTERED STATE", when checking for a registered client.
ims_usrloc_pcscf: Set proper field for service routes, when saving to DB
modules:sipcapture fixed duplicate value
core: new parameter - log_prefix

- can be used to set what prefix to be printed for each log message
  while processing a SIP message
- can contain variables
- example:
  log_prefix="[$mt $hdr(CSeq) $ci]"
ims_auth: Fix crash, if the third parameter was ommited on ims_www_challenge.
msg_parser: fix To parameter with null value parsing
Makefile.defs: version set to 4.2.0-pre0

- pre-release phase - testing period, no new features till branching 4.2
ims_registrar_pcscf: Safety check, if (r) is set (caused a crash)
support vhost in connection
Merge branch 'master' of ssh://git.sip-router.org/sip-router into carstenbock/db_cassandra_deb

Conflicts:
	Makefile.groups
	pkg/kamailio/deb/wheezy/control
	pkg/kamailio/deb/wheezy/rules