We should have Cloud SDK version check in the plugin #668

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There is a new version of the SDK available.
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Latest SDK:
Release: 1.9.42
Timestamp: Fri Jul 15 11:45:47 PDT 2016
API versions: [1.0]

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Your SDK:
Release: 1.9.34
Timestamp: Thu Feb 11 11:36:15 PST 2016
API versions: [1.0]

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Please visit https://developers.google.com/appengine/downloads for the latest SDK.
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Reading application configuration data...


Beginning interaction for module default...
0% Scanning for jsp files.
Success.
Temporary staging for module default directory left in /Users/ynr/Documents/workspace/.metadata/.plugins/com.google.cloud.tools.eclipse.appengine.deploy/tmp/1473183949120/staging
Usage: gcloud [optional flags] <group | command>
  group may be           auth | beta | components | compute | config | container
                         | dataproc | deployment-manager | dns | preview |
                         projects | source | sql | topic
  command may be         docker | feedback | help | info | init | version

The *gcloud* CLI manages authentication, local configuration, developer
workflow, and interactions with the Google Cloud Platform APIs.

commonly used flags:
  --account ACCOUNT      Google Cloud Platform user account to use for
                         invocation.
  --configuration CONFIGURATION
                         The configuration to use for this command invocation.
  --format FORMAT        The format for printing command output resources.
  --help                 Display detailed help.
  --project PROJECT_ID   Google Cloud Platform project ID to use for this
                         invocation.
  --quiet, -q            Disable all interactive prompts.
  --verbosity VERBOSITY  Override the default verbosity for this command.  This
                         must be a standard logging verbosity level: [debug,
                         info, warning, error, critical, none] (Default:
                         [warning]).
  -h                     Print a summary help and exit.
  -v, --version          Print version information and exit. This flag is only
                         available at the global level.

other flags:
  Run `gcloud --help`
  for the full list of available flags for this command.

command groups:
  auth                   Manage oauth2 credentials for the Google Cloud SDK.
  beta                   *(BETA)* Beta versions of gcloud commands.
  components             List, install, update, or remove Google Cloud SDK
                         components.
  compute                Read and manipulate Google Compute Engine resources.
  config                 View and edit Cloud SDK properties.
  container              Deploy and manage clusters of machines for running
                         containers.
  dataproc               Create and manage Google Cloud Dataproc clusters and
                         jobs.
  deployment-manager     Manage deployments of cloud resources.
  dns                    Manage your Cloud DNS managed-zones and record-sets.
  preview                Manage Preview CLI command groups.
  projects               Manage your Projects.
  source                 Cloud git repository commands.
  sql                    Manage Cloud SQL databases.
  topic                  gcloud supplementary help.

commands:
  docker                 Provides the docker CLI access to the Google Container
                         Registry.
  feedback               Provide feedback to the Google Cloud SDK team.
  help                   Prints detailed help messages for the specified
                         commands.
  info                   Display information about the current gcloud
                         environment.
  init                   Initialize or reinitialize gcloud.
  version                Print version information for Cloud SDK components.


For more detailed information on this command and its flags, run:
  gcloud --help

ERROR: (gcloud) Invalid choice: 'app'.

Valid choices are [auth, beta, components, compute, config, container, dataproc, deployment-manager, dns, docker, feedback, help, info, init, meta, preview, projects, source, sql, topic, version].