Update behaviors/query-cache.markdown

Fixed typo
Update behaviors/query-cache.markdown
Update reference/runtime-configuration.markdown

link to PostgreSQL DSN was not good
Fix a typo in customizing-build documentation page

The sample build.properties File given had a typo: prope.output_dir instead of propel.output_dir.
Updated ENUM docs, see: https://github.com/propelorm/Propel/pull/540
Fixed typo
Update reference/model-criteria.markdown

add tips for `select()` method and the use of a custom formatter
Update cookbook/symfony2/mastering-symfony2-forms-with-propel.markdown
Update documentation/08-logging.markdown

Without this edit the log will always output "$message" instead of the actual message.
Update cookbook/multi-component-data-model.markdown

Typo
Update documentation/whats-new.markdown

Active Record reference link is wrong
points to /documentation instead of /reference
Update cookbook/runtime-introspection.markdown

Fixed typo
Update behaviors/sortable.markdown

Typo
Fix bad Pygments language
Update documentation/01-installation.markdown

added tip howto define the PATH variable on windows.
Add travis statuses
Fix index
Update cookbook/customizing-build.markdown

fixed typo
Added a new cookbook entry named 'working with unit tests' that explains how to setup the test environment, write tests and use phpunit.

Adjusted contribute.markdown as well, since there as outdated information. Put there and in documentation/index.markdown a link to the new cookbook entry.
Update cookbook/working-with-unit-tests.markdown