API Endpoint Update and Float Selector Fix

• c9f93fa: Updates API Endpoint Port
• #11: Fixes float selector when the user has items on sale (thanks @z32nissan)

Fixes DOM Node Security Issue

Fixes: #5
PR: #6

Eliminates the use of innerHTML to set the text of the float/seed after retrieval.

Fixes Slow Info Retrieval Handling

PR: #4

Issue:
Sometimes the page doesn't reply with listing info fast enough and retrieveListingInfoFromPage returns null data in the promise.

Fix:
Moves the promises to a separate array that gets satisfied upon the next listing info update from the page

v1.1 - Rewrite

Thanks to @bmwalters, the CSGOFloat extension has been rewritten!

• Improves readability and extendability for the future
• Repositions "Get All Floats" buttons above the listing table