Make report_webkit thread safe by removing parser_instance attribute, as a WebkitParser instance can be shared by multiple thread and thus we don't want a thread to erase parser_instance of anorther thread.
fix indentation
Merge pull request #56 from yvaucher/7.0-fix-1319109

[FIX] report_webkit: avoid sharing parser instance globally and make it thread safe
Merge branch '7.0' of https://github.com/odoo/odoo into 7.0-linux64