Merge pull request #387 from goehle/newgitreadme

Git Procedure and Readme.md

Mike took a look at this and made a few minor changes.
Merge pull request #405 from openwebwork/release/2.9

Release/2.9

This has been looked over by Peter and Myself and Mike has given the go-ahead for release.
Fixed a bug where Tags.pm would complain about editing .tmp pg files.
Fixed a bug where logout didn't remove your key from the db.
Merge pull request #440 from goehle/tag-bug

Tags and Tmp Files (develop)