Fix: web-related crashes

Edited:
Bot.cs - BackgroundWorkerOnDoWork(...)
Added: other exceptions + restart
Improving error messages and fixing non-restarting bug
BUGFIX (to laggingpyro's stuff): Not sure what the purpose of this was, but it appears to cause an infinite loop sometimes
Load inventories asynchronously (requires updating projects to .Net 4.5)
Merge pull request #529 from BlueRaja/AsynchronousInventories

Load inventories asynchronously
Back to .NET Framework 4.0 Patch

Changed:
* Task.Run [.NET Framework 4.5] to Task.Factory.StartNew [.NET Framework
4.0]
Merge pull request #530 from BlueRaja/SteamGroupFunctions

Add functionality for Steam Groups
Merge pull request #534 from gabrielmtzcarrillo/net40

Back to .NET Framework 4.0 Patch
Removed obsolete reference to SteamKit's EChatEntryType.Emote
Merge pull request #536 from FunkyLoveCow/RemoveObsoleteWarning

Removed obsolete reference to SteamKit's EChatEntryType.Emote
Merge pull request #528 from BlueRaja/laggingPyroFixes

Keep bot running after a crash
Merge pull request #531 from FrozenHaxor/master

Adds User Handler feedback on bot's trade request accept/decline.
Bug-fix patch for #404

Surround web call with a try...catch. The exception is silently ignored but needs to be logged.

ref #394
Merge pull request #539 from cwhelchel/fix/i404

Bug-fix patch for #404
Merge remote-tracking branch 'remotes/Jessecar96/master'

Conflicts:
	SteamBot/Bot.cs
	SteamTrade/GenericInventory.cs
	SteamTrade/Trade.cs
	SteamTrade/TradeManager.cs