Add spacy.info module

Print info about spaCy installation, local setup and models. Allow
export in Markdown format to copy-paste into GitHub issues.

spacy/info.py

@@ -0,0 +1,64 @@
+# coding: utf8
+from __future__ import unicode_literals
+
+import plac
+import platform
+import sys
+from pathlib import Path
+from . import about
+from . import util
+
+
+@plac.annotations(
+    model=("Model to download", "positional", None, str),
+    markdown=("Generate Markdown for GitHub issues", "flag", "md", str)
+)
+def main(model=None, markdown=False):
+    info(model, markdown)
+
+
+def info(model=None, markdown=False):
+    """Print info about spaCy installation and models for debugging."""
+
+    if model:
+        data = util.parse_package_meta(util.get_data_path(), model, require=True)
+        model_path = Path(__file__).parent / util.get_data_path() / model
+        if model_path.resolve() != model_path:
+            data['link'] = str(model_path)
+            data['source'] = str(model_path.resolve())
+        else:
+            data['source'] = str(model_path)
+        print_info(data, "model " + model, markdown)
+
+    else:
+        data = get_spacy_data()
+        print_info(data, "spaCy", markdown)
+
+
+def print_info(data, title, markdown):
+    title = "Info about {title}".format(title=title)
+
+    if markdown:
+        util.print_markdown(data, title=title)
+
+    else:
+        util.print_table(data, title=title)
+
+
+def get_spacy_data():
+    return {
+        'spaCy version': about.__version__,
+        'Location': str(Path(__file__).parent),
+        'Platform': platform.platform(),
+        'Python version': platform.python_version(),
+        'Installed models': ', '.join(list_models())
+    }
+
+
+def list_models():
+    data_path = util.get_data_path()
+    return [f.parts[-1] for f in data_path.iterdir() if f.is_dir()]
+
+
+if __name__ == '__main__':
+    plac.call(main)