Add 10.7 buildbot
Merge pull request #7 from matthew-brett/adding-osx-10.7

Add 10.7 buildbot

Added a spare Macbook running OSX 10.7 with builders.
Merge pull request #8 from neurodebian/master

NF: bot for fail2ban (on Linuxes and OSXs)

Just for another project I am involved with. Should be safe and tests do not run too long
BF: adapt builds to new regreg layout
NF: turn on OSX 10.7 builds
BF: don't schedule against build that doesn't exist

builder doesn't exist because it's commented out.
NF: add single git-scheduled sympy build
NF: add sympy doctests
NF: add mail notifier for sympy
BF: fix buildbot URL (for mail messages)
BF: make matplotlib backend svg for sympy tests
RF: need agg as backend to matplotlib
DOC: cleaning up install doc
DOC: more updates to install doc
Notes on adding SSH users for windows
RF: Send Aaron Sympy feedback
RF: allow tuples for pip_depends, easy_depends
RF: switch sympy build to faster machine
BF: add slash to site URL
NF: add slow tests for sympy