changed id to idx
changed floats to doubles
fixed typo in toString function of SampleSize domain object
updated domain layer description
removed extra documentation
added DESIRED_POWER as an allowed enum type for the X-axis
Merge branch 'develop' into release-1.1.  Added "DESIRED_POWER" for
as allowed X-axis type
added patch version
Merge branch 'release-1.1' - patch release 1.1.1 adds DESIRED_POWER
as X-axis type