add example bindings configuration file with comprehensive description

src/bindings.cpp

@@ -252,7 +252,7 @@ bool BindingsConfiguration::read(const std::string &file)
 	return result;
 }
 
-void BindingsConfiguration::generateDefault()
+void BindingsConfiguration::generateDefaults()
 {
 	Key k = Key::noOp;
 	if (notBound(k = stringToKey("mouse")))

src/bindings.h

@@ -113,7 +113,7 @@ struct BindingsConfiguration
 	typedef BindingsMap::const_iterator ConstBindingIterator;
 	
 	bool read(const std::string &file);
-	void generateDefault();
+	void generateDefaults();
 	
 	std::pair<BindingIterator, BindingIterator> get(const Key &k) {
 		return m_bindings.equal_range(k);

src/ncmpcpp.cpp

@@ -98,10 +98,9 @@ int main(int argc, char **argv)
 	Config.Read();
 	Config.GenerateColumns();
 	
-	if (!Bindings.read(Config.ncmpcpp_directory + "keys"))
+	if (!Bindings.read(Config.ncmpcpp_directory + "bindings"))
 		return 1;
-	
-	Bindings.generateDefault();
+	Bindings.generateDefaults();
 	
 	if (getenv("MPD_HOST"))
 		Mpd.SetHostname(getenv("MPD_HOST"));