src: added 'Complex.norm()'
test: added 'Complex.norm()' testing
readme: added 'Complex.norm()' api
src: added 'Complex.conj()'
test: added 'Complex.conj()' testing
readme: added 'Complex.conj()' api
src: added class method 'Complex.polar()'
test: added 'Complex.polar()' testing
readme: added 'Complex.polar()' api
src: added class method 'Complex.proj()'
src: fixed a bug
test: added 'Complex.proj()' testing
readme: added 'Complex.proj()' api
src: added class method 'Complex.cos()'
test: added 'Complex.cos()' testing
readme: added 'Complex.cos()' api
src: used EIGENJS_COMOPLEX_CLASS_METHOD to instead of some codes
src: added class method 'Complex.cosh()'
test: added 'Complex.cosh()' testing
readme: added 'Complex.cosh()' api