Releases for Visual Search

- Redesigned the database schema to store RGB component values for distance calculations
- Updated insert/update helper functions for the new schema
- Rewrote visual search query to use distance calculations on selected colors for greatly improved searching
- Visual search query is much more flexible and dynamic now, and supports searching content types with imagefields
- Lots of individual bug fixes
- Refactored lots of code and got rid of unnecessary functions
- Added more inline documentation to the API