reformat sources with gofmt
separate address library from cli tool; rename cli tool to gobtcaddr
make EllipticCurve properties exportable
simplify cli tool to just print a generated address to stdout

no file/folder/date/labeling stuff
clean up btcaddr package and add godoc comments
export PointAdd, PointScalarMultiply, IsOnCurve of ecdsa
use crypto/* naming conventions in btcaddr
rename btcaddr package to btckey