Merge pull request #7 from awslabs/master

Syncing master and develop
Fix: Adding quites to args, so they will source
Waiting longer for EBS volume to attach.
Merge branch 'develop' of https://github.com/awslabs/cfncluster into develop
Removing install_type option
prepping for 0.0.8
Adding support for T2 instances; AMI updates
Removed sshmaster CLI option; added CLI version checking
prepping 0.0.8