My custom version of Datatables, with some fixes

Hi Blimm,
first of all thank your for your package, I think it is well written and very useful.

However I made some changes to enhance(I guess) some of the features; the changes are commented in the code.

I've included some fixes for the "filtering" function; if the column provided is an alias this throws an error, because the alias is used in the query by Laravel and breaks the SQL structure.

Now the package works with the YADCF Datables plugin (https://github.com/vedmack/yadcf)