1. New units - Flow (CubicMeterPerSecond, CubicMeterPerHour)

2. Add MegaPascals & KilogramForcePerSquareCentimeter to Pressure
3. Add russian to UnitSystem
Renamed AngleTest.cs to AngleTests.cs.
Made CultureInfo in UnitSystem.Create() optional so it defaults to CurrentUICulture, the culture configured in the operating system for presenting localized strings.
Updated usages of UnitSystem.Create() that incorrectly specified CurrentCulture.
Updated ToString() of all units of measurement to round off the double, show an approximately equal symbol and use UnitSystem to get localized unit abbreviation.
Add Revolution
Add entries to CreateCultureInvariants
Add unittests, Revolution, localization to Russian, English (US)
Upgraded projects after opening solution with Visual Studio 2013.
Retargeted project from Win8 to Win8.1

* Src/UnitsNet/UnitsNet.netcore45.csproj
Merge branch 'feature-flow-revolution' of https://github.com/Tirael/UnitsNet
Fixed ToString() of Flow and Revolution to match other classes.
Fixed indentation.
Added missing case for KilogramForcePerSquareCentimeter in UnitConverter.TryConvertPressure().
Fixed variable names in FlowTests.cs from using "meter".
Fixed variable names in Tests\RevolutionTests.cs from using "meter".
Added missing Flow and Revolution in UnitsNet.netcore45.csproj