Clear cache after creating JBrowse instance with management module

[btski]

From the main menu (not-a-real-site.com/jbrowse) I couldn't get any of my urls to work (provides correct address; no redirect/stays on main menu). Took me a long while to figure out that it's necessary to clear cache after each instance is created to get the urls working. Might be worthwhile to include this in documentation.

Related: I vaguely remember main menu links failing occasionally. Maybe issue could be resolved with a daily clear cache cron job? Any idea why the urls are failing?

[laceysanderson]

Hmmm... thanks for the issue report @btski! I'm adding this to my todo list and will try to look into it next week.