char ' breaks the compilation

[olistik]

the charachter ' (html entity: & rsquo;) causes the compilation process to abort.

"\xE2" from ASCII-8BIT to UTF-8
/path/to/gems/closure-compiler-0.3.3/lib/closure/compiler.rb:28:in `write'
/path/to/gems/closure-compiler-0.3.3/lib/closure/compiler.rb:28:in `block in compile'
/path/to/gems/closure-compiler-0.3.3/lib/closure/popen.rb:56:in `popen'
/path/to/gems/closure-compiler-0.3.3/lib/closure/compiler.rb:22:in `compile'

I've found this character in Modernizr:

https://github.com/Modernizr/Modernizr/blob/master/modernizr.js#L541

by simply replacing it with the usual ' solves the problem.