added editorconfig settings i found on the ansible mailing list

.editorconfig

@@ -1,4 +1,21 @@
+# -*- mode: conf-unix; -*-
+
+# defaults
+[*]
+insert_final_newline = true
+
+# 4 space indentation
+[*.{ini,py,py.tpl,rst,yaml}]
+indent_style = space
+indent_size = 4
+
+# for travis
+[.travis.yml]
+indent_style = space
+indent_size = 2
+
 # Override for Makefile
 [{Makefile, makefile, GNUmakefile}]
 indent_style = tab
-indent_size = 4
+indent_size = 4
+