Fix bug in shortcode option name caused by typo.

git-svn-id: https://plugins.svn.wordpress.org/inline-google-spreadsheet-viewer/trunk@1048532 b8457f37-d9ea-0310-8a92-e5e31aec5664
File URLs as `key`s now use the Google Docs Viewer for inline previews.

git-svn-id: https://plugins.svn.wordpress.org/inline-google-spreadsheet-viewer/trunk@1048534 b8457f37-d9ea-0310-8a92-e5e31aec5664
Include `chart` info in help, update readme, version bump to 0.7.

git-svn-id: https://plugins.svn.wordpress.org/inline-google-spreadsheet-viewer/trunk@1048535 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fix formatting error in readme file.

git-svn-id: https://plugins.svn.wordpress.org/inline-google-spreadsheet-viewer/trunk@1048540 b8457f37-d9ea-0310-8a92-e5e31aec5664
Another small formatting bug in the readme file. Oops.

git-svn-id: https://plugins.svn.wordpress.org/inline-google-spreadsheet-viewer/trunk@1048542 b8457f37-d9ea-0310-8a92-e5e31aec5664