Add "-Xconversiontimeout 10000" option for antlr generation to prevent wrong generation with antlr 3.2.

fix test (videolan DNS changed)

fix multiple compilation errors in previous commit, missed because compiling over old version of polarssl

replace unsafe use of sprintf by snprintf
simplify code.
Rename functions not following object oriented design of belle-sip.

Fix bug causing the file_recv callback to be called with a size of 0 before the file transfer even started.

Add parsing a directory to get all certificates in it

optimize belle_sip_object_t (size field moved to vptr)
fix Makefile warning.

when pending transactions are queued in the dialog, newly created transaction must be automatically queued as well, in order to preserve request order.
Previous commit broke the normal way of sending a request through a transaction by not honoring the "outbound proxy" argument.

This reverts commit 8b1a7977.

This reverts commit 2722edef.

add a wrapper to getaddrinfo() to workaround a bug in android's libc not supporting AI_V4MAPPED flag.