Use nose to run unit tests.

1. Adding a plugin to keep track of the total number of tests run as well as the
number of tests with failures/errors.
2. Some nose plugins (including xunit which will be added in a future commit)
assign stdout to a stream object that does not have a .fileno attribute.
spack.util.executable.Executable now avoids passing stdout to subprocess (and
always uses subprocess.PIPE)

TODO:
1. Still need to figure out how to activate the plugin (as of now it is
being ignored by nose). Newer versions of nose appear to make this simpler
(e.g. the "addplugins" argument to nose.run)
2. Need to include new version of nose in order to use xunit

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