Fixed a bug that set the default email_from_name rather than the email_from.
adding wp button styles to button fields in admin
adding id to admin button field type
Improved the check used to see if a user’s value is empty.
Fixed some PHP notices.
Rating fields can now be set to “required” and will force the user to select at least a 1 star rating.
Using the jQuery date picker in the admin should now respect the date format in the Plugin Settings.
Updating to version 2.3.1.
Merge branch 'release/v2.3.1' into develop
Merge pull request #103 from BFTrick/add-wp-button-styles

Adding Default WordPress Button Styles to Button Fields in Admin
Merge pull request #104 from BFTrick/add-button-id

Adding ID to Admin Button Field Type
Set default CSV field delimiter to semicolon

Change CSV delimiter default to semicolon so MS Excel (hsssssss!) will open files properly.
Rollback to comma
Make CSV format filterable

Added filters `ninja_forms_csv_bom`, `ninja_forms_csv_delimiter`, `ninja_forms_csv_enclosure` and `ninja_forms_csv_terminator`.
Merge pull request #107 from mcguffin/develop

Add CSV format filters