Fixed #78
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Fixed #80
merged with bugfix #80
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CLS Compliant
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Merge branch 'master' of https://github.com/sys27/xFunc

Conflicts:
	xFunc.Maths/Expressions/Abs.cs
	xFunc.Maths/Expressions/BinaryExpression.cs
	xFunc.Maths/Expressions/Ceil.cs
	xFunc.Maths/Expressions/Derivative.cs
	xFunc.Maths/Expressions/Div.cs
	xFunc.Maths/Expressions/Floor.cs
	xFunc.Maths/Expressions/Matrices/Determinant.cs
	xFunc.Maths/Expressions/Matrices/Inverse.cs
	xFunc.Maths/Expressions/Matrices/Transpose.cs
	xFunc.Maths/Expressions/Pow.cs
	xFunc.Maths/Expressions/Programming/AddAssign.cs
	xFunc.Maths/Expressions/Programming/And.cs
	xFunc.Maths/Expressions/Programming/Dec.cs
	xFunc.Maths/Expressions/Programming/DivAssign.cs
	xFunc.Maths/Expressions/Programming/Equal.cs
	xFunc.Maths/Expressions/Programming/For.cs
	xFunc.Maths/Expressions/Programming/GreaterOrEqual.cs
	xFunc.Maths/Expressions/Programming/GreaterThan.cs
	xFunc.Maths/Expressions/Programming/If.cs
	xFunc.Maths/Expressions/Programming/Inc.cs
	xFunc.Maths/Expressions/Programming/LessOrEqual.cs
	xFunc.Maths/Expressions/Programming/LessThan.cs
	xFunc.Maths/Expressions/Programming/MulAssign.cs
	xFunc.Maths/Expressions/Programming/NotEqual.cs
	xFunc.Maths/Expressions/Programming/Or.cs
	xFunc.Maths/Expressions/Programming/SubAssign.cs
	xFunc.Maths/Expressions/Programming/While.cs
	xFunc.Maths/Expressions/Root.cs
	xFunc.Maths/Expressions/Round.cs
	xFunc.UnitConverters/Properties/AssemblyInfo.cs
Fixed #81
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Merge branch 'sys27'
differentiate fixed