RF: refactor using explicit paths for python, pip

* Set explicit python and pip path from virtualenv in the hope of
  resolving odd path bugs for the travis build.
* Use delocate without full path (from virtualenv) as the path should
  get picked up from the virtualenv
RF: log messages instead of printing them
RF: remove unused wscript function
RF: add option to force pip install options

Move URL for scipy_installers to install.sh script.
DOC: mpkg -> wheel from copy / paste remnant
DOC: update README on refactoring of atlas process
BF: make atlas opts have empty string default
BF: fix wrongly set ATLAS path
DOC: comments on globals
RF: use git etc to unpack delocate to build

Were installing direct from source tree, but this will give temporary
files in the source tree; use the standard git archive / unpack
mechanism to install instead.
DOC: tiny message fix for cp_wheels
BF: fix bug in ATLAS path
MISC: cat scripts to diagnose delocate error

Delocate scripts failing import in confusing fashion; try and debug.
RF: update delocate to use setuptools
RF: turn down test verbosity to shorten test log

Test log going over travis-ci limits; try and turn down log length.
RF: revert setuptools attempted fix
RF: try upgrading virtualenv
RF: try workaround for shebang line bug
RF: use pip for scipy numpy dependency

(Built wheels on scipy_installers site)
RF: in despair, try downgrading virtualenv

Nothing working for shebang line problems