fixed variable naming bug

this would have either output an empty $after_widget var if $before_widget is designed 
OR
if would have ignored the set $after_widget var if the $before_widget var is unset.
Merge pull request #19 from jaeh/patch-1

fixed variable naming bug
Fixes #22, CSS datepicker conflict
Merge pull request #23 from slushman/master

Fixes #22, CSS datepicker conflict
add customized wp_nonces functions for post-back behavior
Updated changelog.
Merge branch 'hotfix/4.0-nonce-update'
Merge tag '4.0-nonce-update' into develop

1.4.2 release for WordPress 4.0 compatibility