fixed the missing open library link problem, refs #487
added conditional to check if dictionary key exists, fixes #482
lock icon is not shown for govt docs, fixes #480
added missing library key, fixes #493
Merge pull request #492 from gwu-libraries/t480-dont-show-lock-icon-for-govt-docs

lock icon is not shown for govt docs, fixes #480
merging with master
merging t482 with master
cleaned master
Merge branch 't487-missing-open-library-link'
removed the oclc code, fixes #481
Merge pull request #499 from gwu-libraries/t481-remove-oclc-code

removed the oclc code, fixes #481
fixed the missing holdings issue, fixes #479
fixed the missing holdings problem, fixes #479
Merge pull request #500 from gwu-libraries/t479-missing-holdings

T479 missing holdings
fixed the missing gt problem, fixes #406
Merge pull request #501 from gwu-libraries/t406-missing-gt-holding

fixed the missing gt problem, fixes #406
Merge branch 'master' into t423-link-to-articlesplus
limit to catalog items in summon search; added unittest ; refs #423 refs #412