handle edge relationship as string
account for null relationship in nested stmt
log soap faults from openbel-framework
link knowledge network when invalid nodes/edges exist in network

fixes #14
uncaught excp handler; logs to cyto user messages
only update bel.function if column exists

this feature could prevent import of a network that contains a
'bel.function' column...this has been fixed
log unhandled error -> message
fix invalid request to resolve APIs

closes #16
do not invoke on EDT from EDT; closes #17
use doLater (SwingUtilities.invokeLater); safe from any thread including EDT

refs #17
correct conversion; Ws rtype -> displayValue

the Web API client (BasicWsAPI) needs to convert the RelationshipType object
into its displayValue string for use in cytoscape

corrected usage in actions involving edge processing