Fixed an issue with Bioshock 2 Pack and renamed the function to better reflect its function

Bioshock 2 Pack: http://store.steampowered.com/app/7670/
Fixes #461

subscription_savings_check() was returning the wrong value of
.discount_final_price when an item in the "more like this" box was on
sale.
Merge pull request #460 from dapil/patch-1

Fixed an issue with Bioshock 2 Pack and renamed the function to better d...
Fix Battleblock Theater market lookups
Fix < and > characters in market highlighting
Switch to native functions for string rewriting
Update surprise graphics

Since... you know... it's my Steam Birthday today.
Added option to search in names only

I will add a setting in next commit.
Added a checkbox and fixed spaces
Fixed spaces for real
Adds "gift transactions" to account total

This will tally up the total of purchases and gift purchases separately
and display their totals
Check for clicks only when not called by ajax
Added the "Loading..." texts to their own spans
Fixed the positions of the "Loading..." texts
Fixed spacing, merged the styles into one
Merge pull request #465 from dapil/patch-2

Fixed the positions of the "Loading..." texts
Updated to work with continuous search results option
Adds average booster / card prices on inventory

Now if you click on a booster pack, Enhanced Steam will show you the
average price of 3 cards from that game,  which will help you more
easily decide whether to open the booster pack or sell it.
Fix a number of issues with the market information.
Fix advanced market navigation being broken