v1.1.0

• Defaulted BaseVar.diag_eps to System.Config.diag_eps.
• Added option TDS.config.g_scale to allow for scaling the
  algebraic mismatch with step size.
• Added induction motor models Motor3 and Motor5 (PSAT models).
• Allow a PFlow-TDS model to skip TDS initialization by setting
  ModelFlags.tds_init to False.
• Added Motor models Motor3 and Motor5.
• Imported get_case and list_cases to the root package level.
• Added test cases (Kundur's system) with wind.

Added Generic Type 3 wind turbine component models:

• Drive-train models WTDTA1 (dual-mass model) and WTDS
  (single-mass model).
• Aerodynamic model WTARA1.
• Pitch controller model WTPTA1.
• Torque (a.k.a. Pref) model WTTQA1.