Merge pull request #356 from dmundra/hotfix/shibbolethfix

Fixed shibboleth target URL to go to the course selected on login.
Rough draft of new README.md file
Small change
typo in rendering
more proofreading
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Fixed bug where mathview buttons weren't associated to multiple essay boxes.
- Test by making a problem with two essay boxes and checking that the mathview buttons are placed to the side of each box.
Cleaned up the collapse button a bit.
Fixed the depreciation warnings that Perl >5.16 was generating.
Need to check defined on the reference, not the dereferenced array.
Merge branch 'release/2.9' of https://github.com/openwebwork/webwork2 into bugfixes