Added new pressure units and conversions.
Added PressureTests.cs.
Deleted obsolete Src/UnitsNet/UnitConverter.cs
Added KilogramForceToKilogram to Tests/UnitConversionTests.cs
Renamed KilogramEqualsKilogramForce to KilogramToKilogramForce in Tests/UnitConversionTests.cs.
Added a bunch of units to enum in Unit.cs.
Added a bunch of Convert() methods in UnitsHelper to dynamically convert between units.
Renamed Unit.KiloNewton to Kilonewton.
Merge branch 'master' of https://github.com/InitialForce/UnitsNet