Changes to support RDS for GCE
Merge pull request #233 from andylyall/develop

Develop
Replaced take-all getInstance method with a single parameter method taking only mandatory spot price
Replaced take-all getInstance method with a single parameter method taking only mandatory spot price
Merge branch 'develop' of github.com:maksimov/dasein-cloud-core into develop
Fixed formatting etc.
Corrected getInstance to take all mandatory parameters
Merge pull request #235 from maksimov/develop

Develop
Merge pull request #234 from unwin/develop

Changes to support RDS for GCE
Addition of detatchHealthCheck method
Merge pull request #238 from unwin/develop

Addition of detatchHealthCheck method
Add abstract method for detach HCs