Rename SessionStorage to SessionCache
Add moment library
Add expiration/removal to SessionCache
SessionCache ability to refresh expiration on access
GitHub service name consistency, SessionCache -> LocalCache (using localStorage)
Quiet error handling
I think `set` is really more appropriate for this usage
`unset` is the opposite of `set`
Add `keys`, `each` and `cleanExpired` methods
Don't expose LocalCache state as context for callbacks
Prevent intermittent false positives for expiration, ensure expired items are not included in `keys()`/`each()`
Namespace localStorage keys
Test purging of expired caches
Merge pull request #8 from eyelidlessness/features/local-cache

LocalCache service