Update installing_nodes.rst
Update Mailgun usage to use mailgun-php and resolve flysystem version
Handle sub-users using the new permissions system and GSD keys
We probably don't want to set the permissions to the user who owns the server...

(apply permissions to correct user)
This permission node doesn't exist anymore
Have panel redirect to installer if not installed, resolves #322
Fixes issues with sub-users

Updates view page and fixes array being sent
Fixes bug with viewing list of all sub-users
Show message when jar name is updated, resolves #318
No more plugins reference
Cleaner error on power. resolves #317
Unlink files on write or error
Better handling when server is started, closes #328
Show set cpulimt, references #329

Still can’t update it since there isn’t a GSD API to handle it yet.
Fix bugs in API for managing users
Update installing_nodes.rst
Fix the link
Minor changes to how usage charts show up
Down-bump version to 0.7.6
Add support for resetting node and server gsd tokens

closes #330
Should close #327