Change name to steamproxy, to better reflect what it does

Makefile

@@ -1,11 +1,11 @@
 # winegcc is required to compile this program correctly, because
 # we need access to some Linux API
 
-ALL: steamstub.exe
+ALL: steamproxy.exe
 
-steamstub.exe: steamstub.c
-	winegcc -m32 -o $@ steamstub.c
-	mv steamstub.exe.so steamstub.exe
+steamproxy.exe: steamproxy.c
+	winegcc -m32 -o $@ steamproxy.c
+	mv steamproxy.exe.so steamproxy.exe
 
 clean:
-	rm -f steamstub.exe steamstub.exe.so
+	rm -f steamproxy.exe steamproxy.exe.so

README

@@ -1,3 +1,5 @@
+Steamproxy does NOT involve proxy servers. It is NOT a networking proxy. If that's what you're looking for, sorry!
+
 Steamproxy is a simple Windows program that executes a Linux program with the Linux system() library function, then exits after that program returns. It is intended for Linux users running Steam under wine.
 
 Why would you want such a simple program? Why would I write a Windows program for Linux users? Read on to find out!

steamproxy.c

@@ -1,4 +1,4 @@
-/* steamstub.c - A Windows program for Linux
+/* steamproxy.c - A Windows program for Linux
 
 Useful as a wrapper to execute a Linux binary from Windows, and block on its
  return (i.e. getting the Linux system() functionality for Linux binaries from