Stable

[yanne]

Changed error messages to be consistent with Firefox (> 3.10).

Previously, error messages with Firefox were like this:

{"name":"non_existing","validator":"Whatever"}
 {"name":"hello_label","validator":"Hi Flex!"} 

and now they same as with other browser, i.e. like this:

The chain 'name:non_existing' was not found.
Expected "Hi Flex!", got "Hello Flex!"