added git ignore

sender/.gitignore

@@ -0,0 +1,25 @@
+# Docker project generated files to ignore
+#  if you want to ignore files created by your editor/tools,
+#  please consider a global .gitignore https://help.github.com/articles/ignoring-files
+.vagrant*
+bin
+docker/docker
+.*.swp
+a.out
+*.orig
+build_src
+.flymake*
+.idea
+.DS_Store
+docs/_build
+docs/_static
+docs/_templates
+.gopath/
+.dotcloud
+*.test
+bundles/
+.hg/
+.git/
+vendor/pkg/
+pyenv
+Vagrantfile