nws 1.3.1
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1. Allow nwsListWss and nwsListVars to return result in data frame or string.
2. Split sleigh.R to several files
   - move sleighPending class to sleighPending.R
   - move internal functions to sleigh.internal.R
   - move workerLoop to workerLoop.R
   - move sshcmd, rshcmd, and lsfcmd to cmdLaunchOptions.R
3. Add launch.R which includes different ways to launch remote workers
   - web launch
   - cmd launch, which launches workers from worker script
4. Add DEBUG flag to eachElem and eachWorker
5. Add verbose mode to sleigh
6. Allow user to specify chunkSize of each task in eachElem invocation
7. Switched from make.socket to socketConnection to allow binary data
to be sent to the NWS server.
8  Changed serialization of objects from ascii to binary.
9. Added new example programs.
10. Add local launch mechanism, and made it the default launch method.
11. Fixed a problem where loading a saved R workspace fails if a sleigh
object was in the workspace.

nws 1.3.2
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1. Added support for service launch mechanism.
2. Properly quoted the commands to start the workers in addWorker function.
3. Added logDir option to sleigh constructor.
4. Changed the default working directory of workers to be the same as the
master.
5. Changed the rules for the "cmd launch functions" to return vectors rather
than strings.
6. Greatly improved the support for Windows in sleigh, including the
addition of Windows services for the executing the server, babelfish,
and sleigh workers.

nws 1.3.3
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1. Added nwsServer and netWorkSpace convenience functions.
2. Added sleighPro convenience function.
3. Fix rshcmd function to conform to Windows rsh cmd, and 
   add '-n' option to redirect standard input to /dev/null. 

nws 1.3.4
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1. Modified nwsStore to support the R 2.4 version of serialize.
2. Added prototype arguments to various setClass calls to prevent R from
instantiating default nwsServer objects which caused warning message during
build/installation.
