Force tag width & height parameters to a whole number

[micahhenshaw]

It is probably a rare occurance, but I have had a number of times where the combination of image dimensions & the ratio I've selected have resulted in a decimal number in the output of the responsive tags, which isnt valid html. This PR would just make sure that the output of those parameters are always whole numbers.

[ncla]

You may have to update all tests as it may impact all of them.

Snapshots can be updated by passing -d --update-snapshots through PHPUnit's CLI arguments.

I will look at this sometime this week. Nice catch!

[ncla]

Thanks!