TAP Test Harness output delegate for html output

Changes for 0.12

• fix calculating todo_passed tests, GH#7 (tu-maurice)
• applied several tweaks from RT and Github: RT#132072: more international ISO8601-like date format (Slaven Rezić) RT#91317: synopsis of main module and plugin (Slaven Rezić) RT#89216: typo fix (dsteinbrunner) GH#2: gitignore (Gábor Szabó)