[stdlib] Fix I/O related nodes (especially json), there were bad bugs with ioformat.

.gitignore

@@ -2,6 +2,7 @@
 *,cover
 *.egg
 *.egg-info/
+*.iml
 *.log
 *.manifest
 *.mo
@@ -20,25 +21,17 @@
 .installed.cfg
 .ipynb_checkpoints
 .python-version
-.tox/
-.webassets-cache
 /.idea
 /.release
-/bonobo.iml
 /bonobo/examples/work_in_progress/
 /bonobo/ext/jupyter/js/node_modules/
 /build/
 /coverage.xml
-/develop-eggs/
 /dist/
 /docs/_build/
-/downloads/
 /eggs/
 /examples/private
-/htmlcov/
 /sdist/
 /tags
-celerybeat-schedule
-parts/
 pip-delete-this-directory.txt
 pip-log.txt