Cima workflows and actor changes

Changes made to kepler for cima related workflows:

CimaBean: a simple bean containing a byta array of data and a Hashtable of metadata.

CimaBeanListener: a server type actor that receives beans sent over a network socket.

Get Hashtable value: an actor to extract a value from a Hashtable given the value's key. used to extract specific metadata entries from CimaBean hashtable.

SRB Writer: created to write an array of bytes to a file in SRB.

SRB Add Metadata: modified to take a hashtable of metadata rather than an array or MetadataTokens.

A simple example workflow has also been created using these components, the only problem being a bug in ptolemy's ScalarToken and Expression actors where when converting the scalar to a string the string "0.0" is always returned.