any way to speed up gimme tip

[cyberhck]

While using gimme on travis, gimme tip takes the most time, is there any way to speed that up?
Can we maybe cache gimme's data, and if there has been no commit since last build, then maybe don't build but reuse?

[lzl124631x]

+1. Is there a way to cache the gimme binary so that travis doesn't install it everytime?

[philpennock]

Encourage someone to review and approve #151