improve error message when resolve_ctx is missing

Use WTForms translations for (non-custom) validation errors

fix backwards compat issue with form rules + flask.ext.admin

lock flask-login to 0.2.11 until flask-security is fixed

Update base.py - Typing error

A simple typing error (which can create some misunderstanding if we read the code too fast).

fix build errors caused by pillow

CSV Documentation: fix max rows attribute name

Corrections/tweaks for docs

Revert "Make QuerySelectMultipleField fields editable on the list view"

Make QuerySelectMultipleField fields editable on the list view

For QuerySelectField and ModelSelectField, a select data-type is used.
This element does not support select multiple, but the checklist element
does. The same code for compiling the choices is used.

Change export_max_rows default to unlimited

Simplify implementing CSRF validation by adding SecureForm

Add customization options for export columns

For some reason the blueprints aren't included when I run the tests
locally.

This is based on what is done by
`get_details_columns`/`column_details_list`/`column_details_exclude_list`
with the added complication that `get_export_columns` also checks
`column_list` before attempting to invoke `scaffold_list_columns`.