Updated README and copied latest version in.

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+/*
+
+    casm - Simple, portable assembler
+
+    Copyright (C) 2003-2015  Ian Cowburn (ianc@noddybox.demon.co.uk)
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+    -------------------------------------------------------------------------
+
+    Expands an expression.
+
+*/
+
+#ifndef CASM_EXPR_H
+#define CASM_EXPR_H
+
+/* ---------------------------------------- INTERFACES
+*/
+
+/* Converts a number to a sized value.  If the number is negative then the
+   result is returned in twos complement form.
+*/
+int     ExprConvert(int no_bits, int value);
+
+
+/* Returns the result of expr and stores the answer in result.
+   Returns FALSE on error.
+*/
+int     ExprEval(const char *expr, int *result);
+
+
+/* Gets a readable reason for an error from ExprEval() or ExprParse.
+*/
+const char *ExprError(void);
+
+
+#endif
+
+/*
+vim: ai sw=4 ts=8 expandtab
+*/