fix(docs): make sure to pass a valid version to semver

When running the docs locally, master could be the only version in versions.txt, and semver doesn't like it.
By hardcoding in insanely high version number, we avoid that while making sure that we get all the modules for the latest version.

docs/components/docs/docs-services.js

@@ -8,8 +8,11 @@ angular.module('gcloud.docs')
       var VERSIONS = pages.VERSIONS;
 
       if (version === 'master') {
-        // Use the most recent release.
-        version = versions[0];
+        // Set an insanely high version. This is because for master we need
+        // all the modules from the latest version, but when executed locally,
+        // we don't know which one is the latest unless we manually add to
+        // versions.txt
+        version = '1000.0.0';
       }
 
       // Use semver matching to put all matching modules together.