Add option to remove token on autocompleted

[warcode]

An entry of "@mizzao" would result in just the "mizzao" appearing after selection, if the removeToken rule is true.

Would this work?

[mizzao]

Hi @warcode, sorry for the delay in responding. I don't have time to maintain this project anymore, so I gave you commit access to make any changes you'd like. It would be nice to follow the style used by the rest of the code and add some tests to this patch.

If you'd like permission to publish this package to Meteor as well, please send me your Meteor developer username.