ENH: Use entry_points to install the f2py scripts.

This adds entry_points for the f2py scripts. The installed scripts
differ between Windows and other environments.

* On Windows, the only script installed is 'f2py'. This works well in
  that environment because each Python version is installed in its own
  directory, making it easy to keep the differing script versions
  separate.

* Otherwise, three scripts are installed, 'f2py', 'f2py' + 'minor', and
  'f2py' + 'major.minor'. For instance, if Numpy is installed by
  Python 2.7, then the installed scripts will be named 'f2py', 'f2py2',
  and 'f2py2.7'. That naming scheme is used for back compatibility, and
  also so that more than one Python version can be dealt with in a way
  common to many Linux distros. Note that 'f2py' will always point to
  the latest install and 'f2py(2|3)' to the latest Python (2|3) install

The script tests have been modified to check for the new environment
and the code previously used to install the scripts has been removed.

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