Merge pull request #6056 from takluyver/install-kernel-spec-extra-param

Expose extra parameter on top-level install_kernel_spec function

IPython/kernel/kernelspec.py

@@ -186,7 +186,8 b' def get_kernel_spec(kernel_name):'
     """
     return KernelSpecManager().get_kernel_spec(kernel_name)
 
-def install_kernel_spec(source_dir, kernel_name=None, system=False):
-    return KernelSpecManager().install_kernel_spec(source_dir, kernel_name, system)
+def install_kernel_spec(source_dir, kernel_name=None, system=False, replace=False):
+    return KernelSpecManager().install_kernel_spec(source_dir, kernel_name,
+                                                    system, replace)
 
 install_kernel_spec.__doc__ = KernelSpecManager.install_kernel_spec.__doc__