v1.0.0

Version 1.0 release with both the full spectral library and the optimized spectral library.

• Created simpler API interface to create Spectra and Sensor classes
• Improved test coverage, CI automation
• Simplified metadata names to no longer include spaces (e.g. bare ground -> bare)
• Removed anomalous NPV spectra that had clearly bad ASD readings
• Moved earthengine dependencies to an extras install
• Ran a series of analyses documenting spectral variation and unmixing retrieval performance
• Improved API documentation