New API design (SMACK-545)
Add initializer tests and move classpath files

The initializer tests verify that every non-optional initializer, this
includes Providers, is loadable.

Creating files under META-INF is not considered best practice. Smack's
configuration and provider files reside now in classpath directory
qualified by Smack's package namespace.
Move privacy lists from core to extensions
added basic markdown readme
Fix copy&paste error in intro.html
Merge pull request #1 from SnakeDoc/master

Add basic markdown README
Add resource URLs to README.md
Create new subproject 'legacy', move workgroup API into it
Code cleanup: unused imports, values, blocks, etc.