Do not create custom log for HttpError

Update code to use the default logger instead.
Do not create custom log for HttpError

Update code to use the default logger instead. Fixed #139
Merge branch '139-remove-PhpGt-log-file' of github.com:8w/PHP.Gt into 139-remove-PhpGt-log-file
Auto-set the sass debug-info flag if not in Production

Allows sass to write-out the debug info to the processed CSS files -
info that can then be consumed by the firesass plugin etc to debug the
sass/ css files.

Rather than adding another setting, this commit sets the flag based on
the existing isProduction flag - so if isProduction is set to false, the
debug info is compiled-in/

Fixes #147.
Merge branch '147-sass-debug-info' of git://github.com/8w/PHP.Gt into 8w-147-sass-debug-info