Prevent .build creation for accidental builds

ino/runner.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 # -*- coding: utf-8; -*-
 
 """\
@@ -57,8 +57,15 @@ def main():
     try:
         e.process_args(args)
 
-        if current_command not in 'clean init' and not os.path.isdir(e.build_dir):
-            os.makedirs(e.build_dir)
+        # Create a .build directory if required
+        valid_project = os.path.isdir(e.src_dir)
+        do_anywhere = "init clean list-models serial"
+
+        if current_command not in do_anywhere:
+            if not valid_project:
+                raise Abort("No project found in this directory.")
+            elif not os.path.isdir(e.build_dir):                
+                os.makedirs(e.build_dir)
 
         args.func(args)
     except Abort as exc: