Added a couple helper methods.
Now checks server greeting.  Some refactoring.
Slight refactoring of message forming.
Fixed initial status check, bumped version some.

Cheated on the version bump.  Oh well.
Fixed groups call so the README doesn't lie.

Now only queries the groups once, storing the results in an instance variable.
Corrected a get_block_data bug.

Would attempt to get data from the socket after receiving an error message, causing the gem to block when none was received.
Bumped version number.