created a new css theme, hayfield
Example Preso - commented out the default.css overrides
Merge remote-tracking branch 'laura/new_css_theme'
Hayfield Theme - updated the footer style
Example default.css really commented out all the styles this time
Updated Theme list in README
Merge remote-tracking branch 'jorge/working_on_css'

Conflicts:
	example/default.css
Updated Minimal theme to have the correct background on command-line samples
Adding Minimal Theme to the list of available themes
Added example generate presentation command
because I got stuck thinking options were --thing=value
Merge pull request #61 from SustainableWebsites/master

Added example generate presentation command
Adding bullet styles to minimal and minor changes on those slides in the tutorial