Admin area is now separated into a flask blueprint

[cmrn]

Changes:

• Moved admin views, routes, and authentication into a flask blueprint
• Cleaned up the name of some routes and parameters
• Updated calls to url_for to reference the new route names

[brendam]

@cmrn did you notice that this is failing in Travis?

[cmrn]

@brendam fixed! thanks for letting me know.

[brendam]

thanks @cmrn :)