Use IE6 VM for IE7 and IE8 by default and use unar instead of unzip on OS X.
Add iso control files.
Fix IE10 disk unit.
Typo.
Fix unar variables.
Update readme for XP VM reuse.
Fix units for IE7 and IE8 when REUSE_XP is off.
Add acknowledgements to readme.
Bail on xp build if REUSE_XP is off.
Ignore stuff.
Acknowledge uck.
Merge branch 'develop'