add jenkins auto-test script.
add Example input for jenkins,written in yaml
Added arguments of SpectralClusteringTest.
Modified SpectralClusteringTest.
Merge branch 'develop' into HEAD
SimpleTextWriter is added. CSVWriter, StringHelperImple are modified.
Merge branch 'develop' of github.com:scalegraph/scalegraph into develop2

Conflicts:
	src/org/scalegraph/io/impl/CSVWriter.x10
Modified edge attribute name.
Merge branch 'feature/spectralclustering' into HEAD
Merge branch 'develop' of github.com:scalegraph/scalegraph into develop2
resume try catch
add build test
Merge branch 'develop' into feature/jenkinsScripts
add TestTransToCSV
add sed script
fix a bug on CSVReader
add method to retrieve source and target edge list from Graph object
add StopWatch
fix a bug on CSV read header method
some fixes