Fix bug where shortcode content (table `<caption>`) was ignored.

git-svn-id: http://svn.wp-plugins.org/inline-google-spreadsheet-viewer/trunk@1049964 b8457f37-d9ea-0310-8a92-e5e31aec5664
Refactor chart option parsing to use a couple simple helpers.

git-svn-id: http://svn.wp-plugins.org/inline-google-spreadsheet-viewer/trunk@1049965 b8457f37-d9ea-0310-8a92-e5e31aec5664
Version bump to version 0.7.1.

git-svn-id: http://svn.wp-plugins.org/inline-google-spreadsheet-viewer/trunk@1049966 b8457f37-d9ea-0310-8a92-e5e31aec5664