Merge pull request #520 from mbrukman/editorconfig

Added editorconfig for easy style conformance.

.editorconfig

+# For more info, see: http://EditorConfig.org
+root = true
+
+[*.java]
+indent_style = space
+indent_size = 2
+
+[*.md]
+indent_style = space
+indent_size = 2
+
+[*.xml]
+indent_style = space
+indent_size = 2