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about: add important contributors
timeline/elements: don't show all the keyframes when group selecting.

Optimization to workaround clutter being sluggish.
timeline/previewers: don't try to show waveforms when pixelWidth == 0.

Otherwise we divided by zero.
timeline: commit for each container ungrouping.
project: no need to set auto_transition after starting to extract timeline.
pipeline: when not in RENDER, the pipeline can and must recover

... from errors.
render dialog: Don't show keyframe button for codec properties.
waveforms: take in_point and duration into account.
elements: let the backend update keyframes correctly.
project: cast width and height when they are set through properties.
GstDynamicWidget: port combobox to Gtk3 API.
elements: don't edit the clip if it wasn't actually moved.

Fixes https://github.com/pitivi/pitivi/issues/99
clipproperties: After (de)activating an effect, commit the timeline.
waveforms: the sync property of the sink must be set to True.

Otherwise rate modulating was just useless.
pitivi: Clear the timeline when closing projects

Timeline was not cleared when closing the project / creating a new
project

https://github.com/pitivi/pitivi/issues/103
project: Add some debug infos
pitivi: Be less verbose when we can not get pipeline position

In some cases it is just normal, so do not bother the user about it.