add missing attributes

attributes as defined here:
http://developers.meethue.com/1_lightsapi.html#142_response
and here:
http://developers.meethue.com/1_lightsapi.html#162_body_arguments
Merge pull request #3 from sankage/attributes

add missing attributes
remove extraneous whitespace
add additional errors
Fix find_all and clean up returns
Resolve merge conflict
Correct failing test
Bump version
Merge pull request #4 from sankage/errors

add more errors classes
Adding in contributors section