Server v2.3

New features:

• Random Forests implemented (requires Python - see docs for use), use with -rf #128 #115
• Filtering specific routers enabled, use with -filter #129
• Historical routes added, use with GET /location?group=X&n=Y to get last Y fingerprints #131

Bug fixes:

• MQTT configuration adds itself to the current configuration (instead of replacing it)
• Dashboard shows top 3 values for guesses
• Better cacheing