Fix file uploads in edit form

I've removed explicit `request.form` passing to edit form in the form instance
creation. The reason for this is that if we pass `formdata` to the constructor
it considers that all the data it needs, whilst `request.form` contains no
information about uploaded files.

If we simply omit passing `request.form` around, Flask-WTF takes care about
filling the form with `request.form` as well as `request.files`, if there are
any.

Hence file uploads now work in the model edit.

Fix sqlamodel.get_one() when using modified get_query()

Expose to allow overriding in subclass ModelView

Fixed #59. Added list_display_all_relations to sqla backend to show many-to-one relation data in list view

Remote duplicate list_formatters from api docs

Maintain order of form fields when form_columns provided

Block for Overriding Row Actions

Add Travis-CI config for continuous integration testing

Use url/endpoint from passed in index_view if present

Use endpoint/url values from Admin() parameters instead of index_view if present.  DRY default values for AdminIndexView and Admin.init

Fixing typo

on_model_change and on_model_delete hooks

Fixes for boolean fields

Example here: https://gist.github.com/3714266

fix bug in form.py wen checking callable_default