Merge pull request #4 from ihnorton/master

Clean openlibm, libuv before building
Upload to julianightlies, not julialang
fix small error in bottlebuild.sh
Add reporting of commit, and versioning of nightly filenames
Fix small issues
Merge branch 'versioned_filenames'
Small overhaul of logging functionality.  We'll no longer see errors that happen during `build_gitwork.sh`, but that's fine since most of our errors don't happen there anyway.
Clean harder and other minor local updates