Make VTreeTableScrollBody extendable (#13054)

Change-Id: I97fc69c96dd589cb0d5cde0686dca9e1742f2c86
Provides error location for ArithmeticException. (#11877)

Change-Id: Ieb63ad556c3dc01196f0b9898aed9670923c9138
Fixed TabSheet tab bar sizing by removing an obsolete Safari hack (#12343)

Change-Id: I627dee377aa19aab2168152cf7cbe3cfd6f95e10
Changes padding for Textfields with Chameleon theme. (#12974)

Change-Id: Iefccedce67cb04cf3ceb8128cb07c871fc940ab8
Merge with Vaadin upstream 7.1