bin/giraph script overwrites CLASSPATH if "dev environment" detected (this also 
removes USER_JAR from CLASSPATH)

                 Key: GIRAPH-163
             Project: Giraph
          Issue Type: Improvement
          Components: conf and scripts
    Affects Versions: 0.1.0, 0.2.0
         Environment: current trunk of giraph, after running "mvn compile" (as 
advised in the quick start guide). 
Also Hadoop 1.0.1 was used. 
            Reporter: Benjamin Heitmann

If no ./lib dir is present, then the bin/giraph script assumes it is running in 
a "dev environment". 
This chooses an execution path through the bin/giraph script, which overwrites 
the CLASSPATH variable instead of appending to it. 

Incidentally, this also removes the name of the jar submitted by the user, 
which got appended to CLASSPATH earlier in the script. 

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