cancel the last commit

[jehan.procaccia]

Hello

I just commited a major change in my projet althought I hadden't 
commited small changes on the production/stable_relaese one. I just want 
the repository to come back to the relaese it was before that last 
commit, so that I can commit the small/stable changes first, then I will 
tag that release and finally create a new branch for the major changes I 
just did.

How can I cancel my last commit ?

Thanks.