Merge pull request #4641 from gebart/pr/gitignore-clang-complete

gitignore: Add .clang_complete and YouCompleteMe

.gitignore

@@ -53,3 +53,9 @@ pkg/wakaama/wakaama
 
 # Vagrant
 .vagrant
+
+# clang-complete command line argument lists (Vim: clang-complete, Atom: linter-clang, autocomplete-clang addons)
+.clang_complete
+# YouCompleteMe (https://github.com/Valloric/YouCompleteMe)
+.ycm_extra_conf.py
+.ycm_extra_conf.pyc