Merge pull request #30 from vitalyster/libtwitcurl_fix

Libtwitcurl fix
Fix compilation with Swiften2
Set HAVE_SWIFTEN_3 to 0, because these changes are not in 3.0alpha yet
Twitter: store last DM in database and do not send it again on next login
fixed direct messages
Merge branch 'master' of https://github.com/hanzz/libtransport
Merge pull request #31 from vitalyster/dmfix

fixed direct messages
Merge branch 'master' of https://github.com/hanzz/libtransport
fixed crash when spectrum receives xmpp ping from another server
Merge pull request #32 from vitalyster/fix_crash

Fix crash
Merge branch 'master' of github.com:vitalyster/libtransport
Twitter backend: json parsing
Merge branch 'master' of https://github.com/hanzz/libtransport
Merge branch 'twitter_json'