Add basic Emacs .gitignore entries

(cherry picked from commit 2696fee3c6b08cd9645a61ebf08b84fd70be5a72)

.gitignore

@@ -131,6 +131,10 @@ cppcheck-cppcheck-build-dir/
 *.pydevproject
 *.launch
 
+# Emacs
+\#*\#
+.\#*
+
 # GCOV code coverage
 *.gcda
 *.gcno