fix get_grouped_opcodes
Protect against libraries that extend Array.prototype

for (var ... in ...) loops should always check if the property being iterated isn't borrowed from somewhere else.
In this particular case, the code breaks if used in the same environment as old versions of PrototypeJS.
Merge pull request #7 from mmv/master

Protect against libraries that extend Array.prototype
Merge pull request #5 from splewako/master

fix get_grouped_opcodes
add trailing semicolons, fixes gh-6
tipline
Make the difflib code ES5 strict mode-compliant
Fix more undeclared reference assignments
Merge pull request #9 from crdev/StrictModeCompliant

Make the difflib code ES5 strict mode-compliant
Update README.asciidoc