Add additional maxSize param varible

[coderaiser]

4096 it's good default, but would be great to change it to another one :), for example I have 6KB font and would like move it to css also.

So I add additional parameter maxSize which could be used or not. Backward compatible saved.

[Filirom1]

I would prefer if you pass an options object, between rootPath and callback.

Callback should stay the last arguments because this is a node covention.
This will be a breaking change in the API. We will update the major version

[coderaiser]

I agree with you, would be better if callback will be always last parameter so I add options parameter.

[Filirom1]

Great ;)

[Filirom1]

npm publish
+ css-b64-images@0.2.4

[coderaiser]

Thank you :)