Added examples to cmake building process.

Set /WX flas that is warnings as errors on MSVC build.
Updated linux, osx, msvc build to refer to appropriate boost libraries.

example/c/simple_c.c

@@ -0,0 +1,38 @@
+#include <msgpack.h>
+#include <stdio.h>
+
+int main(void)
+{
+    msgpack_sbuffer sbuf;
+    msgpack_packer pk;
+    msgpack_zone mempool;
+    msgpack_object deserialized;
+
+    /* msgpack::sbuffer is a simple buffer implementation. */
+    msgpack_sbuffer_init(&sbuf);
+
+    /* serialize values into the buffer using msgpack_sbuffer_write callback function. */
+    msgpack_packer_init(&pk, &sbuf, msgpack_sbuffer_write);
+
+    msgpack_pack_array(&pk, 3);
+    msgpack_pack_int(&pk, 1);
+    msgpack_pack_true(&pk);
+    msgpack_pack_str(&pk, 7);
+    msgpack_pack_str_body(&pk, "example", 7);
+
+    /* deserialize the buffer into msgpack_object instance. */
+    /* deserialized object is valid during the msgpack_zone instance alive. */
+    msgpack_zone_init(&mempool, 2048);
+
+    msgpack_unpack(sbuf.data, sbuf.size, NULL, &mempool, &deserialized);
+
+    /* print the deserialized object. */
+    msgpack_object_print(stdout, deserialized);
+    puts("");
+
+    msgpack_zone_destroy(&mempool);
+    msgpack_sbuffer_destroy(&sbuf);
+
+    return 0;
+}
+