Added many small bugfixes

0.1.4b,
load balances instance requests randomly among all zones in a
"everything is exactly at threshold price" condition
changed top bunch of instances from "lowest linux/windows" to prices at
or below the threshold price
corrected old hardcoded spot instance request selection that resulted in
invalid region/zone/AMI combinations
made console log output more human readable
started work on stalled instance detection with cloudwatch
cleaned up old comment codes