Update inline-gdocs-viewer.php

git-svn-id: http://svn.wp-plugins.org/inline-google-spreadsheet-viewer/trunk@535973 b8457f37-d9ea-0310-8a92-e5e31aec5664
Replace `thead_rows` with `header_rows`, simplify code dramatically.

git-svn-id: http://svn.wp-plugins.org/inline-google-spreadsheet-viewer/trunk@535974 b8457f37-d9ea-0310-8a92-e5e31aec5664
Use `wp_remote_get()`, as well as `str_getcsv()` if it's available.

git-svn-id: http://svn.wp-plugins.org/inline-google-spreadsheet-viewer/trunk@535975 b8457f37-d9ea-0310-8a92-e5e31aec5664
Version bump to 0.3, update documentation to reflect updates.

git-svn-id: http://svn.wp-plugins.org/inline-google-spreadsheet-viewer/trunk@535976 b8457f37-d9ea-0310-8a92-e5e31aec5664
Bugfixes, test with WordPress 3.8, version bump to 0.3.1.

git-svn-id: http://svn.wp-plugins.org/inline-google-spreadsheet-viewer/trunk@835668 b8457f37-d9ea-0310-8a92-e5e31aec5664