Correct variable name causing js error

http://support.inboundnow.com/support/topic/javascript-bug-when-uploading-background-image-to-landing-page-template/#post-112584
Patch for update button under main headline input.
http://support.inboundnow.com/support/topic/css-bug-in-4-0-1-landing-page/#post-112585
Merge branch 'develop' of github.com:inboundnow/landing-pages