Merge pull request #235 from lbl-srg/electrical_mw

Revision of electrical package
Revised model.
Revised model.
Revised model.
Revised PhaseSystems.
Revised models.
Renamed npin to n

This was done to use the same notation as the MSL Electrical package.
Revised models.

Reference result changed as I increased the stopTime.
Added images and revising package transmission. To be decided if benchmarking data and examples have to be part of the package.
Added documentations for other functions
Merge remote-tracking branch 'origin/electrical' into electrical_mw
Renamed Pow_ to P_ for consistency with Buildings library naming convention.
Renamed variable names according to naming convention.
Revised models.
Renamed useC to use_C, as the library also uses use_T, use_p etc.
Revised models.
Deleted unused Examples folder.