remove requiredness of alt text on images
Restructuring SXSW OERPUB example. Fixes #262
fine tune cleanup
remove a <br>
Merge pull request #11 from wysiwhat/sxsw-oerpub-gh-pages-cleanup

SXSW OERPUB gh-pages cleanup
modify opacity of disabled buttons in the toolbar
override default bootstrap styles for code blocks - make no-wrap with scroll bar
added history and changed demo names.
Merge remote-tracking branch 'tom/bugfix/159-button-disabled' into bugfixes-tom
Merge remote-tracking branch 'tom/bugfix/187-nowrap-code-block' into bugfixes-tom
Merge remote-tracking branch 'tom/bugfix/192-image-alt-text' into bugfixes-tom
Merge branch 'bugfixes-tom' into dev