Issue travis-ci#1190 - Adding Quotes for Orgs & Spaces

Organization and Space names can have spaces in them which will break the login and target commands.
Rather than expecting the user to discover this and fix in their .travis.yml files, it's easy enough to just add the `"` in here.

lib/dpl/providers/bluemixcloudfoundry.rb

@@ -34,8 +34,8 @@ class Bluemixcloudfoundry < Provider
 
       cmds install: 'test $(uname) = "Linux" && rel="linux64-binary" || rel="macosx64"; wget "https://cli.run.pivotal.io/stable?release=${rel}&source=github" -qO cf.tgz && tar -zxvf cf.tgz && rm cf.tgz',
            api:     './cf api %{api} %{skip_ssl_validation_opt}',
-           login:   './cf login -u %{username} -p %{password} -o %{organization} -s %{space}',
-           target:  './cf target -o %{organization} -s %{space}',
+           login:   './cf login -u %{username} -p %{password} -o "%{organization}" -s "%{space}"',
+           target:  './cf target -o "%{organization}" -s "%{space}"',
            push:    './cf push %{push_args}',
            logout:  './cf logout'