If you build the default branch, build latest. Fixes #421.
Refactor build code into method
Optimize _build_version and fix the name
Merge pull request #487 from alex/patch-1

Optimize _build_version and fix the name
Merge pull request #486 from swenson/mavericks-libxml2

Add install help for OS X Mavericks libxml2 workaround
Break up the ugly command line in the OS X Mavericks note