FileAdmin Improvements

improve fileadmin flexibility by moving forms into functions, fix CSRF, and fix error messages on validation failure

Add AppEngine ModelViews for both DB and NDB.

Allow searching non-text SQLAlchemy column types

Add AppEngine ModelViews for both DB and NDB. Tested it works on flask_admin running on my local dev_appserver, and works much better than the built-in appengine admin site. More complex features still remain TBD (queries, as well as nested keys, and probably other obscure features)

Less whitespace for menu macro

Added field id to inline field parent divs

Make SQLAlchemy AJAX filters case insensitive

This is much less surprising to the user than case sensitive searches.

Add documentation for using menu icons

Add documentation for "persistent filter" to get_query

This documents the tip in this issue (for only SQLA): https://github.com/mrjoes/flask-admin/issues/169

Added _search method for mongoengine and pymongo backends for easier override

Fix sorting and searching for relation objects

add menu item settings for AdminIndexView

Fix sorting on related columns

add `menu_class_name`, `menu_icon_type` and `menu_icon_value` for
AdminIndexView

Fix display of initial value in editable list view

Currently, the editable list view is not setting the default value correctly.

With this change, if the value is "Active", when the user first clicks the editable field it will automatically select "Active" in the dropdown.

Simplify delete_form field rendering

add forgotten csrf_token._value() to bootstrap3

Allow easier overriding of editable list view