use array instead of jQuery "add" method to improve performance

[robertfausk]

...when creating list with all inview elements cause there is no need to have a sorted element list.
This improves performance drastically when very many elements have to be checked, e.g. more than 200.
Also removed trailing whitespaces.

From http:https://api.jquery.com/add/

When all elements are members of the same document, the resulting collection from .add() will be sorted in document order;
that is, in order of each element's appearance in the document.

[tiff]

Thank you!

[robertfausk]

Thank you too for very ultra fast merging.
Could you also release a new tag? I think v1.0.1 would be the next step cause there are no changes in api.