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29 break long modules

* transform the module `invenio_tools` into a package with one file per class
* transform the module `harvest_tools` into a package with one file per class
* improve logic to translate error message
* close issue #29

See merge request !22

9 pytest record

* the [pytest](http://pytest.org) framework is working within the track_publications context
* A series of test have been developed to validate harvesters running on ACL, ACTI, COM and PHD records
* Several bugs found in the class `Record` and `CheckAndFix`.
* Close issue #9

See merge request !20

28 python exception

* Few bugs fixed.
* Close issue #28

See merge request !18