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When using C++11, comparison operators are already templated to take anything that can be explicitly converted to double, but constructor took only doubles. This lead to warnings when an `Approx` was constructed from floats, which was problematic for some users. Since just adding float constructor would be a large breaking change, as suddenly `Approx( 1 )` would become ambiguous, I added a templated constructor that will take anything that is explicitly convertible to double. This has the added benefit of allowing constructing `Approx` instances from instances of strong typedefs, ie allowing `calculated_temp == Approx( known_temp)`. Closes #873