New file CanvasConnection.qml

canvas without connectionWrapper
Merge branch 'develop' of github.com:buttleofx/ButtleOFX into develop
Connection input to output / output to input : ok

Still problems with multiples input.
Problems at disconnection too.
Issue #27
Fix bugs connections

fix #27
Merge branch 'develop' of github.com:buttleofx/ButtleOFX into develop