Merge pull request #55 from mattayes/52-lowercase-repo_name

#52 Make default repo_name lowercase

cookiecutter.json

@@ -1,6 +1,6 @@
 {
     "project_name": "project_name",
-    "repo_name": "{{ cookiecutter.project_name|replace(' ', '_') }}",
+    "repo_name": "{{ cookiecutter.project_name.lower().replace(' ', '_') }}",
     "author_name": "Your name (or your organization/company/team)",
     "description": "A short description of the project.",
     "year": "2016",