Cache Details result

[makepanic]

To avoid requesting the details for a given fingerprint every time we could store the result on the first successful request.

Possible implementations:

localStorage:

• wide range of supported browsers http://caniuse.com/namevalue-storage
• limited space http://stackoverflow.com/a/2989317
• useless for more complex objects ( implemented and got QuotaExceededError at < 2000 detailObjects)

indexedDB:

• wip, see https://github.com/makepanic/emberjs-tor-onionoo/tree/indexedDB
• small amount of supported browsers http://caniuse.com/indexeddb -> polyfill available, but uses localStorage
• async -> have to wait result of a cache lookup to decide if i want to request from server or request from db

[makepanic]

Current implementation stores all the detail results in an array and reads from them if a detail is requested that was requested earlier.

[makepanic]

see this commit for details