Merge changes from origin/7.1

a5a9131 Converted LayoutTesterApplication test to TB3
1376429 Fix compilation error in test
7b120fc Tests for validating reconnect works for streaming and websockets (#12868,#12853,#12852)
9e6a82d Force connection to closed state on reconnect (#12853)
e365eee No longer require specifying Atmosphere js version in two places
ca7e928 Update to Atmosphere js 2.0.3.vaadin2 (#12868, #12852)
1cc4dc1 Fix duplicate id issue in test and test more corner cases
c21a684 Prepare for Safari 7 testing (#5288)
7615fd1 Made test more stable and added Firefox reconnect test (#12492)
186696d fix regression related to #12504
c48c94d Reverted change in how hack works (#12727, #12736)
f328340 Fix NPE caused by setting ApplicationConnection too late (#12736)
b47915f Extracted test to separate class
e07e674 Remove possibility to use static inner classes for tests
c4aff77 Fix NPE in fix (#12504)
15dce28 Make test more reliable by updating description which does not update the DOM
6a63d12 Make Panel scroll the correct div (#12736)
cc796b0 Ensure testing Jetty does not run out of heap space
f8da926 Updated to Atmosphere 1.0.18.vaadin1 (#12891)

Change-Id: Ic30441d72c4e45551255724a0dcc3b3fa5a1729b

diff --cc client/src/com/vaadin/client/communication/AtmospherePushConnection.java
Simple merge

diff --cc client/src/com/vaadin/client/ui/VWindow.java
Simple merge

diff --cc client/src/com/vaadin/client/ui/window/WindowConnector.java
Simple merge