src: update 'Complex.equals()' to support scalar argument
test:  update 'Complex.equals()' api
readme: update and add 'comp.equals(scalar)' api
src: update 'Complex.mul()' to support other matrix-objects.

to support Vector, RowVector, CVector, CRowVector, VectorBlock,
RowVectorBlock, CVectorBlock, CRowVectorBlock, MatrixBlock and
CMatrixBlock
test: update instance method 'mul()' testings
readme: update 'comp.mul()' api
appveyor: add appveyor integration for windows testing
ignore 'appveyor.yml' too