OBS: sync with latest versions
core: fix stack waste & runtime ineffiencies

Add static storage qualifier to prevent constants from getting copied to
the stack every time a function is called.
Fix #240: Corrupted HTTP response crashes SIPE

A HTTP response with a body but without Content-Length header caused
SIPE to parse the body contents as next HTTP response. This somehow led
to a crash.

sipmsg.c will now set a special error response code instead of just
complaining about the corrupted message. The caller can now decide on
the correct course of action.

As this removed SIPE_DEBUG_LEVEL_FATAL usage from sipmsg.c and therefore
the only usage of this level, it has now been completely removed from
the core and backend code.

Also made sure that the SIP & HTTP input routines abort parsing the
buffer once the connection has been closed.
Fix #241: Adium filters ":" from "sip:"

The string generated in allowedCharacters method obviously was copy &
pasted from another plugin without adapting it to SIPE requirements.
Updated the string to be in sync with sipe-utils.c:escape_uri_part().
l10n: sync translations with transifex.net (hi, te)

- add new language: te
OBS: updates for Ubuntu 14.04
media: removed call_hangup_cb

Already handled in sipe_media_call_free().
media: factor out common stream initialization