Added configuration file for astyle (a code-formatting tool) that is tailored to our formatting style.

Former-commit-id: ba2f428b6f

util/astyle/options.astyle

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+# Select overall style.
+--style=google
+--mode=c
+--recursive
+
+# Attach brackets to namespaces and classes.
+--attach-namespaces
+--attach-classes
+
+# Of course, namespaces should also be indented.
+--indent-namespaces
+
+# C++ comments starting in column 1 are also supposed to be indented properly.
+--indent-col1-comments
+
+# Add space padding around operators.
+--pad-oper
+
+# Put the pointer/reference operators next to the variable.
+--align-pointer=type
+
+# Add brackets to conditional one-line statements.
+--add-brackets
+
+# Convert tabs to spaces in non-indentation part of the line as well.
+--convert-tabs
+
+# Remove spaces in definition of C++ templates.
+--close-templates
+
+# Don't let lines get too long.
+--max-code-length=140
+
+--verbose