Add LINPHONE_LDFLAGS in CMake script to find linphone.
Prevent rebuilding the documentation if this is not necessary.
Increase required CMake version.
Add two JNI functions for tunnels manipulation

*Add LinphoneCore.tunnelGetServers()
*Ass LinphoneCore.tunnelAddServer()
Merge branch 'master' of git://git.linphone.org/linphone
Add russian translation, thanks to loginov.alex.valer@gmail.com
Fix compilation bug on Android
Update README.macos
Add belle-sip link flags in CMake script to find linphone.
Fix bug #1409
Don't allow values to be empty in a linphonerc file.
Added unit tests for this.

Fixes #1457
Fix remote provisioning zero-length values. Fixes #1457 again.
Fix tunnel bug: reset 'enable register' option in proxy config after enabling/disabling the tunnel
Merge branch 'master' of git://git.linphone.org/linphone