Add filter to make possibility to force options per site on a multisite and add some custom role column

[JulietNoth]

… custom role column

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This pull request fixes issue #.

What's Included in this Pull Request

[bueltge]

Thanks for your PR, great.

[JulietNoth]

Hi Frank, I edited changelog file and wiki to add the new filter hooks. I didn't put my example as I added them to add a new all roles column in adminimize options to allow back end users to check all the row when one option was checked for the all roles column. Let me know if you're interested on this change as I will need to edit adminimize js. If something else is wrong with what I did for this PR, don't hesitate to let me know. I will do what is needed to allow me to add these new filter hooks.

[bueltge]

@JulietNoth Thanks again for your help. I'm really interest on your example, so please add the change to the PR. Please also add a small phpdoc comment to each hook inside the code, like here https://github.com/bueltge/adminimize/blob/e27044bf79cf48fd20ec966a011224d8a50b811f/inc-options/admin_bar.php#L75.