Implement --version switch

src/main.d

@@ -59,6 +59,7 @@ int run(string[] args)
 	bool report;
 	string symbolName;
 	string configLocation;
+	bool printVersion;
 
 	try
 	{
@@ -68,7 +69,8 @@ int run(string[] args)
 			"ast|xml", &ast, "imports|i", &imports, "outline|o", &outline,
 			"tokenDump", &tokenDump, "styleCheck|S", &styleCheck,
 			"defaultConfig", &defaultConfig, "declaration|d", &symbolName,
-			"config", &configLocation, "report", &report,"muffinButton", &muffin);
+			"config", &configLocation, "report", &report,
+			"version", &printVersion, "muffinButton", &muffin);
 	}
 	catch (ConvException e)
 	{
@@ -97,6 +99,12 @@ int run(string[] args)
 		return 0;
 	}
 
+	if (printVersion)
+	{
+		writeln("v0.1.0");
+		return 0;
+	}
+
 	auto optionCount = count!"a"([sloc, highlight, ctags, tokenCount,
 		syntaxCheck, ast, imports, outline, tokenDump, styleCheck, defaultConfig,
 		report, symbolName !is null]);
@@ -310,6 +318,9 @@ options:
     --help | -h
         Prints this help message
 
+    --version
+        Prints the program version
+
     --sloc | -l [sourceFiles]
         Prints the number of logical lines of code in the given
         source files. If no files are specified, input is read from stdin.