Release 0.1.5
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  Release mostly focused on color support improvements.

  * GstAravis: switch to negociated width, height, framerate and pixel format
  * Evaluator: fix support of variable name containing digits
  * Buffer: add a per buffer user data
  * Stream: add a timed buffer pop function
  * Stream: switch to gobject properties for packet resend and socket buffer size
  * Camera: more bounds functions