Format function now uses "instanceof" on a var rather than "typeof" on that var's call to determine if the variable is a function.
This fixes an incompatibility with ClojureScript, which defines String.prototype.call as a function.
Updated minified files
Merge pull request #766 from gensym/develop

Format function now uses "instanceof" on a var rather than "typeof" on t...
Merge pull request #770 from Oire/develop

Updated minified lang files