Revised documentation.
Revised AC.OnePhase package

Renamed linear to linearized for consistency with Buildings.Fluid.
Renamed PerUnit to perUnit according to the naming convention.
Corrected wrong location of defaultComponentName
Merge pull request #275 from lbl-srg/electrical_mw

Merge AC.OnePhase revisions
Renamed PerUnit in perUnit
Replaces Nnodes with nNodes
replaced Nlink with nLinkss