increase histogram time bucket precision

[whyrusleeping]

[aschmahmann]

@whyrusleeping have you tried this branch out and is it giving enough useful information?

[aschmahmann]

I'm weirded out that only the OS X tests are failing here and they're all failing with:

=== RUN   TestSessionFailingToGetFirstBlock
    session_test.go:450: did not rebroadcast whole live list
--- FAIL: TestSessionFailingToGetFirstBlock (0.10s)

Not sure why this PR would effect that though

[whyrusleeping]

@aschmahmann I ran it briefly, it does look better

[BigLep]

@aschmahmann : what do we want to do with this? What's the priority?

[Jorropo]

This repository has been moved to https://github.com/ipfs/go-libipfs. There is not an easy way to transfer PRs, so if you would like to continue with this PR then please re-open it in the new repository and link to this PR.