aap_tweaks.module file is modified

reference -> code4aap/drupal-aap-campaign#117

Survey delay variable is added in AAP_Config and News Image variable is modified
Merge branch 'issue117' of https://github.com/tkuldeep/drupal-aap-campaign into issue117
Merge pull request #124 from tkuldeep/issue117

Amount of time after which a survey should show is configurable now.