Hiding bottom sticker while we click menu.

The error I get otherwise is this:

    And I add a shell build step "sleep 20"   # JobConfigurationSteps.I_add_a_shell_build_step(String)
      org.openqa.selenium.WebDriverException: unknown error: Element is not clickable at point (277, 656). Other element would receive the click: <div class="bottom-sticker-inner">...</div>
        (Session info: chrome=34.0.1847.132)
        (Driver info: chromedriver=2.10.267518,platform=Linux 3.8.0-35-generic x86_64) (WARNING: The server did not provide any stacktrace information)
      Command duration or timeout: 21 milliseconds
      Build info: version: '2.40.0', revision: '4c5c0568b004f67810ee41c459549aa4b09c651e', time: '2014-02-19 11:13:01'
      System info: host: 'elf', ip: '127.0.1.1', os.name: 'Linux', os.arch: 'amd64', os.version: '3.8.0-35-generic', java.version: '1.7.0_07'
      Session ID: 37528a27abb5661c3c6a859cd8668be3
      Driver info: org.openqa.selenium.chrome.ChromeDriver
      Capabilities [{platform=LINUX, acceptSslCerts=true, javascriptEnabled=true, browserName=chrome, chrome={userDataDir=/tmp/.com.google.Chrome.rkeyaR}, rotatable=false, locationContextEnabled=true, version=34.0.1847.132, takesHeapSnapshot=true, cssSelectorsEnabled=true, databaseEnabled=false, handlesAlerts=true, browserConnectionEnabled=false, nativeEvents=true, webStorageEnabled=true, applicationCacheEnabled=false, takesScreenshot=true}]
      	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
      	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
      	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
      	at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
      	at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:193)
      	at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:145)
      	at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:573)
      	at org.openqa.selenium.remote.RemoteWebElement.execute(RemoteWebElement.java:268)
      	at org.openqa.selenium.remote.RemoteWebElement.click(RemoteWebElement.java:79)
      	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
      	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      	at java.lang.reflect.Method.invoke(Method.java:601)
      	at org.openqa.selenium.support.events.EventFiringWebDriver$EventFiringWebElement$1.invoke(EventFiringWebDriver.java:331)
      	at $Proxy58.click(Unknown Source)
      	at org.openqa.selenium.support.events.EventFiringWebDriver$EventFiringWebElement.click(EventFiringWebDriver.java:344)
      	at org.jenkinsci.test.acceptance.po.CapybaraPortingLayer.selectDropdownMenu(CapybaraPortingLayer.java:223)
      	at org.jenkinsci.test.acceptance.po.Job$2.resolve(Job.java:92)
      	at org.jenkinsci.test.acceptance.po.CapybaraPortingLayer$Resolver.find(CapybaraPortingLayer.java:315)
      	at org.jenkinsci.test.acceptance.po.CapybaraPortingLayer.findCaption(CapybaraPortingLayer.java:298)
      	at org.jenkinsci.test.acceptance.po.Job.addStep(Job.java:90)
      	at org.jenkinsci.test.acceptance.po.Job.addBuildStep(Job.java:75)
      	at org.jenkinsci.test.acceptance.po.Job.addShellStep(Job.java:116)
      	at org.jenkinsci.test.acceptance.steps.JobConfigurationSteps.I_add_a_shell_build_step(JobConfigurationSteps.java:21)
      	at ✽.And I add a shell build step "sleep 20"(freestyle_build.feature:35)