add submit_job_wp_handle_upload_overrides filter
Chosen CSS cutting off the placeholder in Firefox.
Added checkbox field type for forms.

Closes #267
Merge pull request #265 from tripflex/overrides_filter

add submit_job_wp_handle_upload_overrides filter
Made backend application email field default to logged in user.

Closes #269
Added filter type option for job categories. Can be set to require matching to any or all selected categories.

Closes #268
Added job-listings-start and job-listings-end.php templates for customisation the wrapping elements.

Closes #262
Only resize local images Closes #264
Fix notice
Added location/keyword option to recent jobs widget.

Closes #241
Lang updates