Added optional Salt to WAMP-CRA
Renamed serverExtra -> authsalt
Use pbkdf2 for password salting
Fixed incorrect prefix and changed subscribe and publish topics to align with examples on server side.
Renamed serverExtra -> authsalt
fixes issue #118
document dependencies in README, issue #116
Use pbkdf2 for password salting
Merge remote-tracking branch 'origin' into wamp_scra
Merge pull request #124 from klemmster/wamp_scra

Wamp scra