Ensure coordinate characters in mouse response never exceed 255

xterm mouse reporting is limited to 223 columns/rows as each position
is encoded in a single character as value + 32.
Update README
Wrap README to 70 characters
Update README with beta blurb
Update version to 1.0b1
support SGR/urxvt styled mouse reporting
Make enable to build without ragel
Remove MTParser.rl
Drop class MTParserState