Prefixed class names

[alvarotrigo]

Great library!
Just one thing, it would be great to have prefixed class names.

Instead of item, which can be quite common in any page, use flex-item.

And yep, I know you can customize it using the container option, but takes a bit to figure out we also have to add the following styles added by default in flexImages.

.flex-item img{
    display: block;
    width: auto;
    height: 100%;
}
.flex-item { float: left; margin: 4px; border: 1px solid #eee; box-sizing: content-box; overflow: hidden; position: relative;  }

Another option is to use an internal class name but still making the class name configurable.
Something like...

// within the library code 
function addInternalSelector(){
    //with a configurable `container` variable
    $(container).addClass('flex-image');
}

Then, even when the user modifies the selector your CSS class will still be applied:

<img class="myCustomSelector flex-image" />

.flex-item img{
    display: block;
    width: auto;
    height: 100%;
}

[SimonSteinberger]

If others need this too, we can implement this option. Otherwise, I'd suggest to just leave it as it is to keep things as simple as possible.

[alvarotrigo]

@SimonSteinberger I realised there's so little CSS :) So kind of make sense. It would just be great if you could mention in the doc we need to change the CSSs when using the custom selector.