Removing redundant invocations of `set -e`
Accounting for iptables nat chains renaming

Signed-off-by: Will Pragnell <wpragnell@pivotal.io>
formatting
Update box version to 375
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mention virtualbox extension pack
Build stemcell in AWS machine

* Specify pipeline for stemcell building

Signed-off-by: Andrei Dinin <adinin@pivotal.io>
Set tmp directory

Signed-off-by: Andrei Dinin <adinin@pivotal.io>
Change ruby to 2.1.2

Signed-off-by: Andrei Dinin <adinin@pivotal.io>