include/string/contain doc errors about chai

[logicalparadox]

One thing to note is that keys behaves differently depending on the modifier..

expect({ foo: 1, bar: 2 }).to.have.keys('foo', 'bar'); // this is strict; all or nothing
expect({ foo: 1, bar: 2 }).to.contain.keys('foo'); // this is inclusion

This is achieved through this.contains, which can be seen triggered here and used here.

Provided that the strict/inclusion feature for keys is not lost, I have no objections. Also, if you would be so kind to include some tests, that would be awesome :)

[logicalparadox]

I fixed the small typos for the docs.

Is the second part, the feature request, something that you have had a chance to look into? It not, I'll slate it for 0.4.x.

[jfirebaugh]

I ended up using similar ideas in chai-jquery, but haven't had time to do it for chai itself. Feel free to put it on the back burner.

[logicalparadox]

i like the idea so im going to leave this open so it doesn't fall into the abyss of closed tickets

[logicalparadox]

This has been implemented in the 0.6.x branch and will be in the next release :)

/cc @vesln