Allow to configure timeout duration by a provider

[tomahim]

Hi,

I really enjoy the work done on postman, it's beautiful and simple.

I needed to change the duration of the timeout, so I propose to add a provider which can be use during the config phase (so it can be extended in the future for others parameters).

Example of use :

angular.module('myApp', []).config(postmanSettingsProvider) {
    postmanSettingsProvider.setTimeout(4500);
});

If you agree with this, can you do the merge ?

Thank you

[CWSpear]

Does this make it postmanSettingsProvider in the config? Can you not name it the same as the factory and then just access it via name + Provider?

[tomahim]

I tried to name it "postman" but postmanProvider is undefined when I use it in the config. I guess it's a conflict with the factory.

[CWSpear]

I like it 👍

Will you add some docs/usage in the README?

[tomahim]

Ok i'm adding some lines to the Readme.

[tomahim]

Done for the README