Scroll hook thread polling adjusttment.

Fixed an issue with the scroll hook thread polling.
Users scrolling near the bottom of the page are making upwards of 7-10 requests a second to the site.

Added a small timer using the "poll_interval_mindelay" value to prevent unnecessary polling, one is enough during this minimum time delay.
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Quick fix to remove lag..

Executing a function to make a get request while simultaneously triggering a scroll event within the executed scroll event is probably not the best idea.

This still needs work, there should probably be something else used to check for updates, such as an event where page has focus or something else that doesn't get called so many times, preferably something that reduces the timer instead. 

This is just a quick fix to stop all the lag on threads when scrolling near the bottom.
Merge pull request #126 from bui/quote-selection

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Merge pull request #125 from ScriptKi77y/master

Scroll hook thread polling adjusttment.