establishment_means and occurrence status filters in place
moved logic to the model
error/bug taken care of in scopes, added filter button, taxonchooser still acting weird
filters default checklists appropriately.
apply checklist filters only to checklists
double taxon bug for taxonchooser is fixed
might not need those hidden fields at all..
merged with master
migrated
translations needed
filter by observed before rank
fix to how with_leaves builds on previous filters
added some translations to checklist filters
changed to absent/not absent, adjusted the filter to accept other status types, and made not absent the default.  Also took a stab at the spanish... probably not right
occurrence_status = nil means that they are not considered absent
Couple of minor pre-merge changes.
* spec fix
* wrapping issues on labels
* not absent -> present
* native filter should include endemic
* taxon selector should load preselected taxon (change taxonchooser
  init)
Merge branch 'EvanBurchard-issue_198'
Minor fix for lists controller.