Update README.
Update URL.
Refactor IPTCModule._save().
Fix #45.
Start 0.3.0-dev.
Fix the method signature of the alias() callback.
Handle extensions aliases.
Handle real_name of extensions.
Add tests for alias and real_name.
Replace assertIn() with assertTrue().

Unittest in Python 2.6 does not have assertIn().
Merge pull request #49 from ldx/assertin

Replace assertIn() with assertTrue().
Add /lib64/xtables to the extension search path list.
Modprobe ip_tables when ip4tc is loaded.
Merge pull request #50 from ldx/lib64

Add /lib64/xtables to the extension search path list.
Merge pull request #51 from ldx/modprobe

Modprobe ip_tables when ip4tc is loaded.
Add section about counters to README.
Generate README.md from RST files in doc.

The command to update README.md:

pandoc -f rst -t markdown doc/intro.rst doc/examples.rst -o README.md
Release 0.3.0.
Start new dev version.
Add example with negation to docs.