Better handling of boundary conditions

Trying with serialport.readpartial

app/helpers/SearchingForSyncState.rb

@@ -2,7 +2,7 @@ class SearchingForSyncState < StatePattern::State
   def handle_byte_stream(bytes)
    idx = 0;
    # spool unwanted bytes
-   while (bytes[idx] != Synchronizer::SYNC_PATTERN[0]) do idx = idx+1 end
+   while (idx < bytes.length && bytes[idx] != Synchronizer::SYNC_PATTERN[0]) do idx = idx+1 end
    
    #p "Found pattern at idx = #{idx}"
    transition_to(ConfirmingSyncPatternState)