zodb / relstorage / 257

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travis-ci

Implement saving/loading the local cache to/from a file.

As #92 shows, this can have a profound performance impact (depending on
the hit rate, of course, and the relative speed of the
database/Memcache).

This still needs a lot of cleanup, specific testing, and documentation.
Committing as a WIP.

138 of 138 new or added lines in 4 files covered. (100.0%)

4092 of 4407 relevant lines covered (92.85%)

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