added runnerId to context, so strider-git can select ssh git clone implementation based on runner, e.g. docker runner

Author: chriz2600

lib/job.js

@@ -326,7 +326,9 @@ Job.prototype = {
       phase: this.phase,
       job: this.job,
       branch: this.job.ref.branch,
-      project: this.project
+      project: this.project,
+
+      runnerId: this.config.branchConfig.runner.id
     };
 
     return context;

test/test_run.js

@@ -53,7 +53,8 @@ describe('Integration', function () {
     }], { // config
       dataDir: '/tmp/',
       cachier: cachier,
-      io: new EventEmitter()
+      io: new EventEmitter(),
+      branchConfig : { runner : { id : 'dummy' } }
     }, function (err) {
       if (err) return done(err)
       for (var name in called) {