Fixed: XCodeCapp reads the user's shell environment

Before this fix, XCodeCapp always ran under /bin/bash, causing problems when trying to source the files from other shells, like /bin/zsh

This fix reads the shell information directly from the user's environment and XCC to run using that shell.

Tools/XcodeCapp/TNXCodeCapp.h

@@ -40,6 +40,7 @@ extern NSString * const XCCListeningStartNotification;
     NSString                        *XCodeSupportProjectName;
     NSString                        *XCodeTemplatePBXPath;
     NSString                        *profilePath;
+    NSString                        *shellPath;
     NSString                        *PBXModifierScriptPath;
     NSURL                           *currentProjectURL;
     NSURL                           *XCodeSupportProject;
@@ -99,4 +100,3 @@ extern NSString * const XCCListeningStartNotification;
 - (NSDate*)lastModificationDateForPath:(NSString *)path;
 
 @end
-