OPSkins Quick Key Seller

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Efficient tool to quick sell your keys to OPSkinsSource code is available at:
https://github.com/Poheart/OPSkins-Quick-key-seller

Version 1.8 update(17/7/2016);
Added 'key index' where you can select next batch of keys to prevent selecting the older items that are not refreshed. (Thanks Nermal for feedback)
Added new key type.
Added extension icon
Fixed numerous script error

Version 1.7 update(1/7/2016):
Fixed my mistake for erroneously included other unrelated js file to extension

Version 1.6 update(23/6/2016):
Various improvements and bug fix
Auto-save last selling price
Auto-submit after pressing on 'Add keys' button

Version 1.4 update:
-Various improvements and bug fix
-Select key type to sell