R1:d5ee8c792c85

Modified DarkConsole Error Log to show more detailed information.

Summary:
When function phlog() is called, stacktrace and detailed log information
is shown in DarkConsole.

Test Plan:
Called 'phlog' function from various places in Phabricator and checked that
the debug information was available in DarkConsole.

Reviewed By: epriestley
Reviewers: epriestley
CC: jungejason, epriestley
Differential Revision: 101