Update README.md

Oops i found the new wiki link
Merge pull request #68 from laapsaap/patch-2

Updated link to Opauth repo.
Fix broken links in README
Merge pull request #69 from fjorgemota/patch-1

Fix broken links in README
Removed yii-opauth and minor formatting.
Correct links after repo move
Merge pull request #80 from AD7six/patch-1

Correct links after repo move
Fix Merge conflict
Set exit to false by default. When calling it inside of a Controller class exit() will trigger the call to __destruct() if the class has one. By setting it to false, it is left to the developer to do an explicit exit(), so the program doesn't barf