Fix bulk downloader hanging.

• Fix the bulk download class threads.

Source group and Satellite lookup functions

This release contains potentially backwards incompatible changes.

• Add source group lookup
• Add satellite lookup
• Make source group and satellite name optional on type specific searches
• Remove underscores from parameter names on all SeDASAPI functions (this may break existing code with named parameters)

Satellite name and source group paramters

Add satellite name parameter to search
Add source group parameter to search

completion notifications

• Improved documentation
• The bulk download can now take a queue to put messages on when a download completes.

first release on pypi

• Documentation improvements
• Wheel building