new test for next()
make sure the names are db-friendly
make the building of the store saner
release stuff
v0.2.1

 [API CHANGES]

 [BUG FIXES]
 - ensure class names are db-friendly (replace '::' by '_')
 - fix calls to next()
 - Make the building of the store a bit more sane.

 [DOCUMENTATION]

 [ENHANCEMENTS]

 [NEW FEATURES]

 [STATISTICS]