Disambiguate use of 'Context'.

See http://forum.kde.org/viewtopic.php?f=218&t=119829
Merge remote-tracking branch 'origin/1.6'
Be able to get documentation for type of instances

Example:
"QPoint point;"
        ^-- cursor here

Now the "Show Documentation" shortcut retrieves the help of "QPoint",
didn't do anything before this patch.

REVIEW: 115991
Remove custom FindQJSON.cmake

Make sure we're still able to compile against qjson <= 0.7.1