Add get_project_dir
Enable specifying project by name
A pipe which adds project to node
Add get_configure_safe
Revise documents and function names
Merge pull request #133 from termoshtt/project_util

Add add_tag pipe
Update completion.
Update sphinx conf.
Update sphinx configure.
Hot fix in io.SyncDataHandler.update
Bug fixed in normalize.
Merge pull request #134 from termoshtt/io_update_bugfix

Hot fix in io.SyncDataHandler.update
Change interface of resolve_project_path.
Add add_run pipe.
Add add_conf pipe
Add untag pipe.
Add tests of add_conf, add_run and untag.
Update zsh completion.
Minor change.
remove tag.