Add option to disable statusline modification.

[doronbehar]

I really like your plugin, It's exactly what I was looking for but I felt this little twik was needed to make it perfect for me because I use airline. I was trying to add an extension for airline for your plugin but It's perhaps a little bit hard at the moment because of the way your plugin is built with all the dictionaries. What do you think?

[jeetsukumaran]

Thanks!