Added version 1.5.008.

Changes in version 1.5.008:
    - Split USE statement into two statements: CONNECT and USE.
      CONNECT is to connect to a MongoDB instance without consideration
of
      any particular database.  USE is to connect to a MongoDB database
on
      the current MongoDB instance.  So typically a CONNECT statement
would
      come first and that would be followed by a USE statement.
    - Added new statements:
      - SHOW DATABASES
      - CREATE DATABASE
      - DROP DATABASE
      - SHOW INDEXES
      - EXECUTE SCRIPT