v3.2.0

#34 Refactor packet_config
#43 Add ccsds_log_reader.rb as an example of alternative log readers
#45 Slow shutdown of CTS and TlmViewer with threads trying to connect
#46 Add mutex protection to Cosmos::MessageLog
#47 TlmGrapher RangeError in Overview Graph
#49 Make about dialog scroll
#55 Automatic require of stream_protocol fix and cleanup
#57 Add OPTION keyword to support passing arbitrary options to interfaces/routers
#59 Add password mode to ask and ask_string

Migration Notes from COSMOS 3.1.x:
No significant updates to existing code should be needed. The primary reason for update to 3.2.x is fixing the slow shutdown present in all of 3.1.x.