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The ApplicationToCreate class contains a "properties" field, a map where
additional properties may be specified. Each library implementation
should specify the handled properties.

Now it is possible to specify a buildpack URL for CF deployments.

* All resources instantiate a generic DeployParametersImpl.
* Clients expect a generic DeployParametersImpl.
* Provider-dependent translation from REST to client interface is done
  in a ParametersTranslator class.
* All tests adapted.
* More-sensible saving of uploaded file.

TODO: Move provider-dependent translation to client. Receive
provider-dependent properties in REST interface (storing them in
DeployParameters.properties)

HerokuSession follows contract.
HerokuIT is normalized and passes.

Added Git functionality to locally clone a repository and push to a
remote URL. Heroku session is now able to clone a repository from (e.g.)
GitHub and push it to heroku repo corresponding to the application.

TODO: HerokuSession still have to pass the ITs.

TODO: This approach can be extended to do the deployment of an artifact.

The class (GenericServiceImpl) reads providers' description from a json
file. Check default config file in service/src/main/resources.

The ResourceSet is intended to easily setup a list of instances, each of
them managing different providers.

NOTE: the client interface WILL change.

(e.g. Pivotal, OpenShift Online)

Improves root response showing the path mapped to a provider.

List of changes:
* The provider API version is set in X-PaaS-ProviderVersion.
* A provider have a set of allowedVersions and a default version
* A PaasResource now can handle more than one client version
* OpenShift is now generic and allows specifying the API endpoint.
* OpenShiftOnline is the old OpenShift resource.

Created an AbstractProviderIT that checks expected results from a
sequence of (right or wrong) operations. This way, all providers should
be tested the same way, and give the same results. Dummy and
CloudFoundry tested against it.

OpenShift deployment from git url. Added ITest that shows usage.

Several modifications:

* tests.config.properties moved from library to common
* Service exceptions moved from service to service-model
* Added gitUrl to DeployParameters (needed for deployment in OpenShift)
* OpenShift deployment code in REST moved from OSResource to PaaSResource
* REST service now supports deployment from artifact or from git url.

DummySession modified to be compliant with the exception contract in the
library side. TODO: Modify the rest of provider sessions.

getApplication() and create() adapted. Client adapted. Tests
and integration tests implemented.

Libraries should throw the exception when needed. Done for Dummy and
CloudFoundry. CloudFoundry tested with CloudFoundryAuthenticationIT.