use loop index instead of explicit increment of column

see http://stackoverflow.com/questions/7537439/how-to-increment-a-variable-on-a-for-loop-in-jinja-template#comment16308022_7537466

Change `data-role` attribute for `Select2TagsWidget`.

image upload field: fixed for change form if file was already uploaded

Prevent <escape> key from confirming deletions

This reverts commit 2e107edc.

This reverts commit 756b9412.

Merge branch 'fix/nullable-on-relation' of git://github.com/antoine-lizee/flask-admin into prs-to-merge

Merge branch 'table_responsive' of git://github.com/abandonedbyrochacbruno/flask-admin into prs-to-merge

Signed-off-by: 1dot75cm <sensor.wen@gmail.com>

Signed-off-by: 1dot75cm <sensor.wen@gmail.com>

Allow using ModelViews in inline_models, and permit multiple levels of inline-model nesting

Replace list_columns with columns_list in examples/sqla-hybrid_property

fix a bug in example code

removed deprecated list_columns attribute
use column_list instead

Merge from central repo into bryhoyt's fork