adding search and import functionality

git-svn-id: https://plugins.svn.wordpress.org/pressbooks-textbook/trunk@996890 b8457f37-d9ea-0310-8a92-e5e31aec5664
tagging version 1.1.7

git-svn-id: https://plugins.svn.wordpress.org/pressbooks-textbook/trunk@996896 b8457f37-d9ea-0310-8a92-e5e31aec5664