v.0.3.7

• Simplified use of optional parameters - functions.

Previously, passing in an invalid parameter-function, such as dest for methods page and sequence or cb for method batch would throw an error, if the parameter was a non-empty value and not a function.

Now if such parameter is not a function, it will be simply ignored.

This is to make it consistent with the general promises specification where optional callback functions are only used when they are specified, but no error is thrown when they are non-functions.

• Updates in tests and documentation.