Fixes #4.

Fix a bug where too many spaces would sometimes be removed.

Wait to decode bytes received from the server until a full line has
been received. Data received from the server could end in the middle
of a UTF-8 multibyte sequence, and decoding the data without waiting
for the rest of the line would result in a decoding error.

Docstrings don't have to be enclosed in triple quotes; update GPL
exception to apply to all strings to reduce confusion and licensing
issues.

Would crash if "=" was not present in an argument.

If event handlers take fewer arguments than are available,
an error will no longer occur.

Use RPL_ISUPPORT PREFIX and CHANMODES.