Since chrome headless has been merged, js error messages are
difficult to read: some information was missing or only displayed in
full all log.
All console.error() will now be displayed in build details, and will
appear just before the python assertion.
XMO's improvement will also be used on all log: Using module and
classname of the class calling phantomJS.
Also: some small improvements on error messages to make them easier to read
Note: this commit also shown that some error were not detected:
now we will fail in any case if js log an error.
XavierDo
22dc335803