Fix project URL in README.md

The old url ('Github' instead of 'GitHub') points to a pretty old page.
Fix NPE on hook page
Merge pull request #66 from praseodym/patch-1

Fix project URL in README.md
Merge pull request #67 from praseodym/fix-hook-npe

Fix NPE on hook page
Consistent spelling of 'GitHub' and corrected several spelling mistakes