Improve disallowSpaceBeforeBinaryOperators rule

Add check for assignment to disallowSpaceBeforeBinaryOperators rule
Improve requireSpaceBeforeBinaryOperators rule

Add check for assignment to requireSpaceBeforeBinaryOperators rule
Improve disallowSpaceAfterBinaryOperators rule

Add check for assignment to disallowSpaceAfterBinaryOperators rule
Improve requireSpaceAfterBinaryOperators rule

Add check for assignment to requireSpaceAfterBinaryOperators rule
Update readme for binary rules