Preparing package.xml for v4.4.0

Fixes bug in related to SoftDelete behavior in preDqlDelete, closes #17

More coverage tests.

Adds another approach to add custom cache key
parameters for authenticated users.

Fixes minor bug with non-unique invoker namespace
names in Cachetaggable template.

Updates README file with information how to use
"cache.filter_cache_keys" event.

Prepare new package v4.2.2

Preparing package v4.2.1

Prepare package. Add test environment notes to the README.markdown. #15

Added NestedSet behavior support with tests, closes #14

Preparing to release v4.0.0 (package.xml)

Preparing package for v3.1.0, updated README, mini-refactorings in te…

…sts.

Preparing to make a package

Preparing to create package v2.1.3