Generate proper branch param for the NAT ping requests
Credits go to Varun (varunvairavan on GITHUB)
Closes #145

(cherry picked from commit 1f18541ced045645f8cbda1c73a85fe52597a1db)

Conflicts:
	modules/nathelper/sip_pinger.h
mi_json: escape '\\' character

also fix incorrect '"' escaping

(cherry picked from commit 28b399bb166a786bb0e943ff072606d2d01d96b6)

Conflicts:
	modules/mi_json/http_fnc.c
remove bogus flushing for mi_json

TODO: find a proper way for handling flushing, since the current
implementation leads to a infinite loop

(cherry picked from commit 0d47a32d18c656a22aa536f5eeb24e3310ade481)
(cherry picked from commit bd38945a28f0ac93fb3be306d550b04e8d424d05)
revert bogus commit for mi_json

(cherry picked from commit fe6533689857f165f2c77a5c65f0b248cac82ef3)
Merge pull request #150 from staskobzar/master

opensipsctl is calling ds_relaod for dr instead of dr_reload
(cherry picked from commit 6b6be3057762fb9d0e98bcea104e02d45a30b4c2)
Fixed bogus triggering of PUBLISHing for non-INVITE sequential requests.
Credits go to Damien Sandras
Closes pull request #149