Fix Colander link in README.rst
Merge pull request #15 from martijnvermaat/patch-1

Fix Colander link in README.rst
Increase version number 0.1 -> 0.2: this branch will break things :P
Decrease development status from beta to alpha.
Add new schema class: SQLAlchemySchemaNode.
Add few tests to validate its behaviour.
Add specific SQLAlchemy and Colander version.
Update __init__.py of the package to use the new version.
Change tests to use new version.
Removed modules and classes related to 0.1x version.
Add Python 2.6 in setup.py
Remove Python 3.1 and 3.3
Add TOX ini.
Change .gitignore to hide .coverage and .tox
Create SQLAlchemySchemaNode.check_overrides.
Add tests to improve coverage.
Add tests to increase coverage up to 96%.
Add tests to reach 99% coverage.
Add SQLAlchemySchemaNode.dictify.
Add tests to increase coverage up to 99%.
Add default title for SchemaNode.
Fix bug in dictify method.
Fix bug on column.default handling: add check for 'arg' attr.
Add default values for autoincrement PK
during serialization/deserialization.
Fix unused imports in test_schema.py.
Change "version" var in Sphinx conf.py