support for being specific about your bottle, via -b flag

include/cellar.hpp

@@ -4,12 +4,16 @@
 #include <string>
 #include <vector>
 
+#include "bottles.hpp"
+
 using namespace std;
 
 namespace cellar {
     extern void print_header();
     extern void print_version(int,vector<string>);
 
+    extern bottles::Bottle active_bottle;
+    
     extern bool verbose;
 }