Set indentation to use spaces instead of tabs, add auto indentation script

.clang-format

@@ -63,4 +63,4 @@ SpacesInParentheses: false
 SpacesInSquareBrackets: false
 Standard: Cpp11
 TabWidth: 4
-UseTab: ForIndentation
+UseTab: Never

format-code.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+find . '(' -name '*.h' -o -name '*.c' ')' -exec clang-format-3.7 -style=file -i '{}' \;