Add add_comment pipes.
Add test.
Add server manage script
Add a class handle data
Rename DataHolder > DataHandler
Merge branch 'utilities' into start_script
Merge pull request #29 from kenbeese/add-comment

Add comment
Add a status print
Cache data path
Merge branch 'pr/28' into master.

Remove duplicate sentence.

Conflicts:
	bin/execute_all_test
Merge branch 'master' into DataProcessorServer
Add comment about default value
Merge pull request #33 from termoshtt/start_script

Add server manage script
Merge remote-tracking branch 'kenbeese/DataProcessorServer' into server_api
Add new API to execute a pipe