Genepattern-notebook

* GenePattern workflow execution interface added. For more information see the [Workflow Execution documentation](http://genepattern-notebook.org/basic-features/#workflow-execution).
* Support for job result syntax added to GenePattern analyses. This is a simple syntax for specifying GenePattern analysis inputs based on the output of of upstream jobs. For more information see the [Job Result Syntax documentation](http://genepattern-notebook.org/programmatic/#result-syntax).
* Added support for renaming, hiding or overriding the output variable in the UI Builder.
* Major refactoring of code structure and file names.
* Updated Javascript code to ES6 standard.
* New webpack build process added.
* Bug fixes.

* UI Builder now has type-specific support for file, number, password and bool parameters.
* Placeholder job cells added
* Job cells can now send a browser notification when a job completes.
* Added the ability to programmatically set the output variable in the UI Builder.
* Add ability to pass in custom function import path in the UI Builder.
* Bug fixes

* Bug fixes
* Usability fixes
* UI Builder widgets will add themselves to the Tool Manager

* Improvements to the UI Builder
* Support for ipywidgets 7
* Bug fixes

* Beta release of the UI Builder
* Package restructuring
* Bug fixes

* Parameter group support
* Call Widget bug fixes