make noexpandtab explicit in all vim modelines other than xml files

Conflicts:
	src/include/switch_core_media.h
	src/mod/endpoints/mod_sofia/sofia_media.c
	src/switch_core_media.c
mod_rayo: added missing modeline
Merge branch 'v1.2.stable' of git://git.freeswitch.org/freeswitch into v1.2.stable