Investigate MongoDB encryption and security solutions

[colinxfleming]

https://docs.mongodb.com/manual/tutorial/configure-encryption/

Raised by @Kevin-Wei for further investigation. Might be worth checking to see if mongolab has one of these solutions.

[colinxfleming]

Mongolab's pricing and etc: https://mlab.com/plans/

[colinxfleming]

And Mongolab's security documentation: http://docs.mlab.com/security/

[colinxfleming]

@Kevin-Wei can you look into a solution for this on Thursday and report back? Feel free to tag in someone else who's curious about mongo or encryption and have them help investigate what other people are doing on the cheap, as well.

[colinxfleming]

Renaming and removing question since this is an investigate matter rather than an open discussion kinda thing now.

[colinxfleming]

Closing in favor of #413 -- we're not going to buy mongo premium or anything like that and anything we wind up doing will be thru mlab.