Use ajax api request to get market hash.

[Rudokhvist]

Changes

• Uses /ajaxgetbadgeinfo/ API endpoint for getting own badges - this allows to get market hash of cards.
• cards are matched by card number instead of card name - in case /ajaxgetbadgeinfo/ and badge pages return different names.
• Use market hash to fill trade offers - should solve issues like Users who use steam language other than English may sometimes get error "Items missing" #22
• Added custom user-agent header to requests to ASFB - for statistics tracking.

Needs extensive testing before merging. If anyone wants to help testing - installation link is here

[Bertaz]

Tested and it seems to work better than master. It finds an additional trade for Ultimate General: Civil War.
It's also slightly faster, ajax version took 10m 31s 143ms, while master took 10m 37s 913ms. This was with only 1 tradable badge. I imagine the difference will be higher with more badges/bots.
Quickly checked the verbose output and it seems to do everything correctly:

Log output

very long files, gzipped
2 tradable badges, found 6 matches
_{previous log with no available matches}

The warning from #26 is not present in this version.
_{I checked the verbose logs for any personal information. It seems to only lists cards, my timezone and bots' steam profile ids, not even listing my profile id. Please tell me if I missed anything.}