#631 Auto Scale Groups Filtering

Auto Scale Groups Filtering
skip filter if values are empty (TheWeatherCompany/grid-api#509)
Merge branch 'develop' of https://github.com/TheWeatherCompany/dasein-cloud-aws into develop
#631 auto scaling group filtering. backwards compatibility is done for tests
Fixes for upstream pull request.

Fixes #1, #4, and #7 discussed in
https://github.com/greese/dasein-cloud-aws/pull/128.
Merge branch 'develop' of github.com:TheWeatherCompany/dasein-cloud-aws into develop
Changed vlan/subnet conditional to use subnetId for launching instances.
TheWeatherCompany/grid-api#108. Instance userData
Merge branch 'develop' into issue-667
#667 remove cc1.4x from launch list