add support for persistence through DETS

[wstucco]

add persistence tests

when launched with persistent: true the ExRated server
will persist data on disk in a file with the same name
of ets_table_name.
When started with persistence activated, ExRated will reload
the data from the disk, store it in memory and continue from there.
When stopped (actually when terminate is executed), the data will
be persisted back on disk.

[grempe]

Merged and version 1.2.0 pushed to hex.pm. Thanks! I added some trivial docs too, please check that they are correct.

https://hex.pm/packages/ex_rated/1.2.0

[wstucco]

great, thanks!
just a quick note on the docs: persistent must be true to activate the on disk serialization.
I also made the ets table public for testing purposes and forgot to change it back to private.
Could you fix it or do you want me to send a new PR?

thanks again, great module

[grempe]

Would you mind new pull request for docs and fix? Thanks
On Mon, Jan 18, 2016 at 14:08 Massimo Ronca notifications@github.com
wrote:

great, thanks!

just a quick note on the docs: persistent must be true to activate the on
disk serialization.

I also made the ets table public for testing purposes and forgot to change
it back to private.

Could you fix it or do you want me to send a new PR?

thanks again, great module

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