Added reference for sqrt, sine and cosine.
Absolute value.
Added tangent.
Added asine.
Added acos and fixed asin.
Added atan.
Changed Pi to pi.
Fixed whitespaces formatting.
Added pi.
Added pow.
Pow intro.
Added modulus.
Fixed wording.
Added three functions: color, unit, convert
Indicate functions only in the 1.4.0 beta