Purge IE

Purges the Debug and Release folders (#179, #448), in particular (sizes in kb):
```
	86331392	IE/BHO5.sdf
	1268264	IE/Debug/RESIE.ilk
	37224448	IE/Debug/RESIE.pch
	6269952	IE/Debug/RESIE.pdb
	1846272	IE/Debug/vc100.idb
	4091904	IE/Debug/vc100.pdb
	36831232	IE/Release/BHO5.pch
	5467136	IE/Release/BHO5.pdb
	4075520	IE/Release/vc100.pdb
	106496000	IE/ipch/bho5-a9477527/resie-abeb1384.ipch
	79777792	IE/RESIE.sdf
```

In order to merge this it apparently HAS to be rebased - and so does ever single branch everyone currently has taken out. This is to prevent the old history being merged back in. However, since it's only IE files which nobody works on (or I don't know of anyone working on it), it shouldn't cause any conflicts. 

The new head then has to be FORCE pushed back up to change the history. May also need to contact Github to tell them to purge the cash of those large files.