Preserve sequences when hummingbird is disconnected.

[GoogleCodeExporter]

When the user turns off the hummingbird, sequences in progress in the sequence 
builder are lost. 

Original issue reported on code.google.com by emily.ha...@gmail.com on 17 Jul 2011 at 8:34

This is now fixed in the sequence builder (not expression) in the BirdBrainDev Branch