Autoload library pieces

Added Wellness::Base.dependency to allow for libraries to be required at
the time the class is loaded. It plays nicely with the autoloader.

Moved VERSION into lib/wellness.rb since the entire library is
autoloaded.
moved json require to lib/wellness.rb
added simplecov
Added more tests to get this library covered
Merge pull request #3 from warmwaffles/mj/autoload

Autoload library pieces