include search button icon

embed a generic search button icon.
Merge branch 'searchplugin' of https://github.com/razor-1/reveal.js
merge search plugin, adjust styles
-- added some customized files (start with underscore)
-- remove custom _reveal.css; keep changes in normal reveal.js
-- personal changes will be labeled in comments: --DW--
Remove unessecary file
Add shift+space functionality
remove unused file (closes #360)
Error check to prevent exception from Cipher
bugfix - continue autoslide after resume
Load socket.io client lib from CDN

Based on user feedback, it was very non-obvious that if using an
web server other than multiplex/index.js it would be necessary to
upload the socket.io client libs. This negates that problem.
Fixed some typos in the documentation
Merge pull request #367 from wtw/patch-1

Fixed some typos in the documentation
add missing theme readme
merge conflict
remove extra whitespace
Merge branch 'shift-space' of https://github.com/remybach/reveal.js into dev
update version to 2.4
Merge branch 'bugfix-pause' of https://github.com/EverythingMe/reveal.js into dev
new build for autoslide pr