add quick start
recommit
add who should want DeepDive
Merge pull request #119 from guotai/develop

A sketch of the quick start and the target user.
Update logback.xml

Change to debug level logging (cannot separate levels for stdout and file)
Update logback.xml

Revert to info-level logging
Update ProcessExecutor.scala

Redirect json_extractor UDF output (stderr) to INFO-level logging.
Update index.md
update settings parser for gpunload
prototype change (add parallelGrounding) for groundfactorgraph and dumpfactorgraph
update assignID function for greenplum
add parallelGrounding function
add converting grounding file format
update building sampler command
handling trailing /
clean up grounding folder
added gpunload pipeline
Added gpunload interface
Remove commented grounding code
add gpunload test