add a Queue and Stack

Signed-off-by: Joshua Rubin <jrubin@zvelo.com>
remove Stringer requirement from gil.Interface

Signed-off-by: Joshua Rubin <jrubin@zvelo.com>
get 100% test coverage on binary search. add gil.String type.

Signed-off-by: Joshua Rubin <jrubin@zvelo.com>
add .travis.yml

Signed-off-by: Joshua Rubin <jrubin@zvelo.com>