Updated to API 0.3

git-svn-id: http://plugins.svn.wordpress.org/gathercontent-import/tags/2.3.0@852660 b8457f37-d9ea-0310-8a92-e5e31aec5664
Change API key tooltip
Functions to save and delete pages from DB
Add activate and deactivate hook and make use of new functions to get page
Save selected pages to db
Merge branch 'refs/heads/hotfix-page-limitations'
Update version info