Bumping version to 0.5.1
Add Tomas Brambora to AUTHORS file.
Fix typo.
Update copyright year to include 2013.
Remove Vincent from the contacts as he seams to no longer be interested.

In June 2012 Vincent closed the pull-request and deleted his
``python-rewrite`` branch. He did not answer my e-mail regarding this.
I interpret it as not being interested any more.
Add CHANGES.txt file.
Build map-pages and html-docs in docs/, not in docs/_build/.

This should result into a more concise dist-package.
Include map-pages and html-docs into sdist-package.
Exclude boiler-plate files when generating docs.
Add a decent documentation master-file (content taken from README.rst).

(Up do now this file was just the one generated by sphinx-quickstart.)
Exclude source-files and -links from html-pages.
Exclude build artifact from distribution package.
Remove maintained `make.bat` originating from sphinx-quickstart.
Finished release 0.5.1.
Finished release 0.5.1.
Bumping version back to 0.6.0dev.

This reverts commit d29a5e0de38bd86d254299bc5d67e6f697b7cdf7.