fix the delete unused card script
remove byebug
Merge remote-tracking branch 'wagn/master' into delete_restricted_card
add functions for source preview page's javascript
fixed untracked files
Merge remote-tracking branch 'henry/source_preview_page'
modify according to the comment
add json import
added source structure json
patched source structure json
patching bogus json
removed old json import files
Merge remote-tracking branch 'henry/source_preview_page'