PageManager: Pause overlay timeout on page spawn.

When a Page creates another Page, pause any timeouts on the underlying
Page.
Merge branch 'master' of github.com:cryporchild/tsheese
PageManager: Use a timer to poll for jobs (yuck!).

Unfortunately this change is needed to keep the response to new jobs
within a resonable time (new: < 0.1s - 1s < old < 10s). Still not sure
why there was such a delay in sending jobs between threads with ecore or
edje, but this is an okay workaround (for now!).