Support Phobos sockets. Dependency on Vibe.D can be disabled via -version=MySQLN_NoVibeD.
Update readme.
Fixed: Assertion failure when retrieving a TIMESTAMP or an unsigned floating-point/fixed-point type.
Fixed: Compile errors for bindParameter due to obsolete, improperly-removed "dummy" relic.
Make Phobos-only the default.
New features: Get field/param information, and support null values in prepared statements.
Don't bother reopening closed connection just to send QUIT command.
Removed Connection's dtor. Can't explicitly close() from dtor without risking InvalidMemoryOperationError, because the socket sub-objects may have already been destroyed.