MIT.
Implementation of physical property.
StandaloneInstantiation class docstring edited for clarity.
Edits to test method names for clarity.
PhysicalProperty now raising TypeError when __set__ is called with non-numeric value.
Tests for find_PhysicalProperty function.
Function to find the PhysicalProperty data attributes of a given object.
Removed crufty import statements.
Reorganize directory structure
Describe scope of repo
Add installation file
Add init for multi-file module
Update test file for new API, new ver. of astropy
Clean up cruft whitespace
Update test file for new API
Import all appropriate functionality
Bump version number
Remove files pertaining to `PhysicalProperty`
Merge code from `physicalproperty` tag 1.0.0

Closes #49.