Added Tests/AreaTests.cs.
Implementing IComparable, IComparable<Area> in Area.cs
Added enumerations for area units.
Added tests for area in UnitConverterTests.cs and UnitValueTests.cs.
Implemented dynamic conversion for area units in Src/UnitsNet/UnitConverter.cs.
Merge branch 'master' of https://github.com/InitialForce/UnitsNet