Add "spec" keyword for pipes_dict
Add new keyword "parameter" for show_runs pipe using "spec" new keyword
Add validator for new pipe format
Add empty dict into old style pipe definition
Adapt new format in dpmanip
Change pipe format in execute
Remove spec keyword
Merge pull request #142 from termoshtt/pipe_nargs

Pipe nargs
Beautify json output.
Add filter_path pipe.
Add remove_node pipe.
Enable to change default_rcpath to environment varibale DP_DEBUG_INI.
Update dpmanip zshcompletion.
Enable to specify whitelist by string.
Add change_name pipe.
Add test for pipes/__init__.py.