Add eachdist and move tox to root folder (open-telemetry#29)

Move tox and other configuration files to root folder. Add eachdist to make it
easier to handle operations with different packages.

The eachdist is taken from opentelemetry but slighty modified to avoid ignoring
a given path.

scripts/check_for_valid_readme.py

@@ -0,0 +1,51 @@
+"""Test script to check given paths for valid README.rst files."""
+import argparse
+import sys
+from pathlib import Path
+
+import readme_renderer.rst
+
+
+def is_valid_rst(path):
+    """Checks if RST can be rendered on PyPI."""
+    with open(path) as readme_file:
+        markup = readme_file.read()
+    return readme_renderer.rst.render(markup) is not None
+
+
+def parse_args():
+    parser = argparse.ArgumentParser(
+        description="Checks README.rst file in path for syntax errors."
+    )
+    parser.add_argument(
+        "paths", nargs="+", help="paths containing a README.rst to test"
+    )
+    parser.add_argument("-v", "--verbose", action="store_true")
+    return parser.parse_args()
+
+
+def main():
+    args = parse_args()
+    error = False
+
+    for path in map(Path, args.paths):
+        readme = path / "README.rst"
+        try:
+            if not is_valid_rst(readme):
+                error = True
+                print("FAILED: RST syntax errors in", readme)
+                continue
+        except FileNotFoundError:
+            error = True
+            print("FAILED: README.rst not found in", path)
+            continue
+        if args.verbose:
+            print("PASSED:", readme)
+
+    if error:
+        sys.exit(1)
+    print("All clear.")
+
+
+if __name__ == "__main__":
+    main()

scripts/coverage.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+set -e
+
+function cov {
+    pytest \
+        --ignore-glob=*/setup.py \
+        --cov ${1} \
+        --cov-append \
+        --cov-branch \
+        --cov-report='' \
+        ${1}
+}
+
+
+coverage erase
+
+coverage report
+coverage xml