New onPreStart hook, updated JS minify, handle object exception logging

• Refactor on jsdom memory leak to call window close and to no longer cap jsdom resources #300
• Added resource counting to ensure rest of feather is properly releasing dom objects thru the manager #300
• Upgrade jsdom to newest stable 1.5.0 #300
• Cleanup #300
• add onPreStart app hook #297
• re-enables js minify using newest uglifyjs #297
• Handle exception objects passed to logger that don't match specific signature #298