introduced new isSIUnit function that also checks for compoud units
according tests
add indexOf to SampledDimension
add respective tests for indexOf in SampledDimension
add positionAt method to SampledDimension
add [] operator to SampledDimension
add tests for new methods of SampleDimension
added method to SampledDimension that returns the axis defined by the dim
added test for SampledDimension::axis method
Merge pull request #422 from jgrewe/dimensions

Dimensions

Sweet!