More precise description of the master branch.
Fixed ReST.
More informative README. More useful order of links.
Fixed typo.
Fixed typo.
More explicit wording.
Fixed "python3 setup.py install" when setuptools is not installed.
Merge branch 'master' into release
Merge branch 'release' into release_python2.3

Conflicts:
	uncertainties/__init__.py
	uncertainties/test_uncertainties.py
	uncertainties/unumpy/core.py
Merge branch 'master_python2.3' into release_python2.3

Conflicts:
	uncertainties/test_uncertainties.py