Add manual cron job buttons

[orenyk]

Following last semester's month-long cron outage, we should have some way for admins to manually trigger cron jobs so that we don't run into issues where reservation statuses are horribly out of date (see #1274). We'd have to look into the process for triggering rake tasks via web request (e.g. does it have to be written as a separate controller action vs lib task...).

[TyPetrochko]

Does this seem like the appropriate way to do this? Also - should this feature be accessible from Admin dropdown in the navbar at the top of the screen?

[orenyk]

This answer seems to be the most relevant to me; you're going to want to create a set of controller actions that run various rake tasks. Alternatively we might just offer the option to trigger either the hourly tasks or the daily tasks (using the tasks we set up for Heroku), limiting it to two actions.

In terms of placement, we can just place the buttons inside the settings page so that we don't have to worry about setting up a separate view for this. How does that sound?