Moving views>apps; implementing a separate view manager and sync rendering
MetaPath v1.5.0 release

Adds a visual drag-drop workflow editor, matplotlib, improved interface/API.

* Drag-drop visual workflow editor
* Matplotlib support for most standard graphing types
* Dyanmic view manager, refreshing views on data output via delegate
* View updates occur out of the main/processing threads
* Drag-drop data import in editor
* View inspector, see processing outputs
* Process status, progress bars
* Initial implementation of informative error handling