Revert commit d8185759

This reverts the commit that deprecated the with statement and added
a note to the docs that binding expressions will be compiled in strict
mode in Qt 5.2.

It turns out that we had to keep the with statement and enabling strict
mode breaks just too much unfortunately.

Change-Id: Id38c27f684fbfcb6b6b848be8f691658089d1adb
Reviewed-by: Lars Knoll <lars.knoll@digia.com>