Adds Checks for Successful Trade Completion.

This checks the trade status for trades that end successfully. It then shuts down
the trade normally. The Trade.OnClose event is fired correctly as well. This fixes
long-standing bugs where a bot couldn't accept trades until it timed out (as if
it was still in trade).
Changed start up to only print bots that AutoStart
Merge pull request #342 from FunkyLoveCow/LogCleanUp

Changed start up to only print bots that AutoStart
Merge pull request #322 from cwhelchel/fix/tradeclose

Fix for successful trade completion.
Fixes starting and stopping bots at incorrect time

Adds a new attribute to `RunningBot` to keep track of whether a bot is running or not.
If running, it won't start it again. If not running, it won't try to stop it again.

Should fix #343 and fix #344
References #329 (possibly fix as well)
Merge pull request #354 from FunkyLoveCow/StartStopFix

Fixes starting and stopping bots at incorrect time (fixes #343 and fixes #344)
Adds integration with Travis.
Merge pull request #358 from Jessecar96/TestBranch

Adds integration with Travis.
Fixed Bot Start/Stop Error
Updated to the newer version of SteamKit2.
Merge pull request #360 from Jessecar96/SteamKitNew

Updated to the newer version of SteamKit2.
Merge pull request #357 from thesandvichisaliar/StopStart-Fix

Fixed Bot Start/Stop Error
Updated SteamKit2 submodule to latest commit
Throws exception if added item is detected as a duplicate - fixes #364
Merge pull request #372 from waylaidwanderer/master

Detects duplicate items being added; updated SteamKit2 submodule