Phase out use of StringIO in importer views

StringIO was used to create a file-like object that the csv library
could write to. Since django HttpResponses are file-like objects, this
is not necessary.
Set minimum password length of 6

fixes #161 on github.
Merge pull request #162 from steventlamb/bug/minimum_password_length

Set minimum password length of 6
Point /species/ CSV export to importer export

The CSV exporter used in the importer app exports the fields in the
correct format for importing. Pointing the export URL to this exporter.
Don't cache species views

It's unclear why this really small dataset is being cached, given that
it is only accessible to admin users and will never have a large
volume of requests.
Merge pull request #160 from steventlamb/bug/species_csv_field_order

Bug/species csv field order
Migrate urls to use namespace

Fix url resolve crash pages in importer
Add optional extra fields to species export

Fix unicode crashes in CSV export by encoding to utf-8.

wip. works with extra fields included.

fixup extra fields included
Add test for species csv export
Merge pull request #163 from steventlamb/bug/species_csv_field_order

Bug/species csv field order
Fix missing fields in species csv export

This bug was discovered on the staging server.
Merge pull request #164 from steventlamb/hotfix/fix_species_export

Fix missing fields in species csv export
Update settings with default itree mappings
Fix naming conflict - the field is just called 'type'
Merge remote-tracking branch 'upstream/v1.3' into v1.3
Add support for eco.py region-based itree codes

Previously you could only specify a single itree code, such as 'BEM
OTHER'. Now you can provide a list of regions and codes such as:
'InlEmpSEA:BEM OTHER,TrpInWBOI: PEL OTHER' and the tree's location will
be used to determine the region
Windows line endings are screwy

Use 'universal line ending' mode.
Include underscore on the status page
Add total eco benefits to status page

Note that the feeds function returns an 'eco' key which is
thunk. Evaluate it at your own peril to get the total eco benefits for
the instance.
Use a valid default itree region