Clean up .gitignore references to personal tools

Change-Id: Icf86ae434400c93ad6e20863f557d8143a56d906

.gitignore

@@ -1,3 +1,15 @@
+# Add patterns in here to exclude files created by tools integrated with this
+# repository, such as test frameworks from the project's recommended workflow,
+# rendered documentation and package builds.
+#
+# Don't add patterns to exclude files created by preferred personal tools
+# (editors, IDEs, your operating system itself even). These should instead be
+# maintained outside the repository, for example in a ~/.gitignore file added
+# with:
+#
+# git config --global core.excludesfile '~/.gitignore'
+
+# Bytecompiled Python
 *.py[cod]
 
 # C extensions
@@ -33,11 +45,6 @@ nosetests.xml
 # Translations
 *.mo
 
-# Mr Developer
-.mr.developer.cfg
-.project
-.pydevproject
-
 # Complexity
 output/*.html
 output/*/index.html
@@ -49,11 +56,6 @@ doc/build
 AUTHORS
 ChangeLog
 
-# Editors
-*~
-.*.swp
-.*sw?
-
 # Files created by releasenotes build
 releasenotes/build