Add `load_into_argparse`
Rename server.py into dpserver and use dp.rc
Make genzshcomp support dpserver

Conflicts:
	lib/dataprocessor/argparsers.py
Add nodes.normalize and its pipe
Fix an error in dp.rc.load
Write doctest
Merge pull request #131 from termoshtt/rc_hotfix

Fix an error in dp.rc.load
Merge pull request #129 from termoshtt/normalize_pipe

normalize pipe
Remove default specifier from _dpserver using sed
Merge pull request #126 from termoshtt/dpserver

Rename server.py into dpserver and use rc.py
Introduce nodes.update

fix doc

Conflicts:
	lib/dataprocessor/nodes.py
Add new strategy "raise"

Revise tests for dp.nodes
Revise update strategy in dp.io
Revise update strategy in pipes.add_node

Revise test for pipes.add_node