Add KawaseBlurFilter

[finscn]

It's a more faster blur algorithm than Gaussian Blur.

more details at : https://software.intel.com/en-us/blogs/2014/07/15/an-investigation-of-fast-real-time-gpu-based-image-blur-algorithms

P.S. : @bigtimebuddy , I don't add any document about it , because it's too hard to me in this filter...
And I think this filter is not for junior user , if an user wants to use it well , he/she needs to understand the algorithm.

After this PR be merged , I will update AdvancedBloomFilter , make it support KawaseBlurFilter

[finscn]

About performance , you could see this : http://finscn.github.com/pixi-filters/index.html

try <fish> Blur filter (pixi.js) & <fish> KawaseBlur filter , you will see KawaseBlur is faster.
And in some cases , it's more than 4x faster , and in some cases it's less than 2x.
But whatever , it's always faster.

[bigtimebuddy]

@finscn I like this filter and the performance benefits but it's very difficult to use. Can you suggest anyways we might improve to make it more usable?

[finscn]

I have an idea.
Give me some times.

[finscn]

@bigtimebuddy , Done.
Please review & refactor it , make it better , thanks.

Now, it could generate kernels by blur & quality.

And for Advanced Users , they still could custom kernels by themselves.

[bigtimebuddy]

Much better!