Added support of containingAllOf

[GaneshSPatil]

containingAllOf helps to assert whether a subArray is a subset of the actualArray or not.

Example:

var numbers = [1, 2, 3];

assert.that(numbers).is.containingAllOf([1]);
assert.that(numbers).is.containingAllOf([2, 3]);
assert.that(numbers).is.containingAllOf([1, 2, 3]);

assert.that(numbers).is.not.containingAllOf([5]);
assert.that(numbers).is.not.containingAllOf([1, 5]);
assert.that(numbers).is.not.containingAllOf([1, 2, 5]);

[goloroden]

Hi @GaneshSPatil :-)

Just to make sure I get things right: The new function checks whether all of the expected values are contained within actual, but it would even be okay if it contained other elements, right?

So it basically is a subset check, isn't it?

Since I merged #19 before this one, there are now some conflicts. Would you mind resolving them?

[GaneshSPatil]

Hey @goloroden,
containingAllOf checks whether the all the elements of expected are present in actual.
expected need not contain all the elements of actual.
And expected can not contain any element which is not present in actual.

For Example:

assert.that([1, 2 3, 4]).is.containingAllOf([1]);
assert.that([1, 2 3, 4]).is.containingAllOf([1, 2]);
assert.that([1, 2 3, 4]).is.containingAllOf([1, 2, 3, 4]);

assert.that([1, 2 3, 4]).is.not.containingAllOf([1, 2, 5]);

[goloroden]

Okay, then I got it right. Thanks for the clarification :-)

And thanks for updating the PR that fast :-)

[goloroden]

And PS: Once again - really great work :-)

Thank you so much for submitting your ideas and code, and for taking the time to do all this! I really appreciate that!

A new version will be out in the next ~10 minutes.