pip disappeared for some reason
I am pretty sure that the reason these symlinks changed was due to the homebrew updates announced in version 1.3.0:


  "The most significant change since 1.2.0 is that brew install python
  no longer installs a python binary without manual PATH additions and
  instead installs a python2 binary. This avoids overriding the system
  python binary by default when installing Python as a dependency. It
  also paves the way to eventually have python be Python 3.x."