Altered the behavior of "Number" when no time information is provided and the number is a scalar.
Added "Reference Frame" to the list of parameters for Position.
Merge branch 'master' of https://github.com/cleder/czml
Fixed a bug in the Number class.
Merge branch 'master' of https://github.com/cleder/czml
Merge pull request #4 from Carl4/master

Fixed a bug with the Number class. 
OOPS sorry I didn't notice you pull request, Thanks!
And yes a unit test would be very much appreciated