TODO

* (better) error handling
* logger
* contributors guide
* add catmandu-examples as tests
* split into separate modules:
  * Catmandu::Exporter::BibTeX
  * Catmandu::Exporter::XLS
  * Catmandu::Importer::Atom
  * Catmandu::Store::ElasticSearch
  * Catmandu::Store::Solr
  * Catmandu::Store::DBI (?)
  * Dancer::Session::
* remove Dancer from Catmandu::Exporter::Template
* turn Dancer::Plugin::Catmandu::* into Plack::App::* (?)
* validation
* remove Fixable, add before_add and before_get, takes fixes or sub
* give Iterable fix method
* give Iterable export, export_to_string methods
* bag drop
* Searchable handle index optimize
* split Searchable into Searchable and CQL Searchable (?)
* generator should guard with a magic ref, not undef (?)

