fix content context not having access to repl functions (since
xulrunner 15)

See https://developer.mozilla.org/en-US/docs/XPConnect_wrappers#__exposedProps__.
Maybe enhancing the javascript interactor with special commands would
be a better solution.
add Conkeror compatibility
make repl.evaluate take an optional context parameter
Fix for Firefox 20

When I upgraded to Firefox 20, mozrepl stopped working.  The extension
would load but would never start accepting connections

Traced it down to chrome/content/repl.js throwing errors because of
all the unquoted in it.

Ran it through JSLint as well and cleaned it up