updated for version 7.4.151
Problem:    Python: slices with steps are not supported.
Solution:   Support slices in Python vim.List. (ZyX)
Added tag v7-4-151 for changeset ec02e1474bc2
updated for version 7.4.152
Problem:    Python: Cannot iterate over options.
Solution:   Add options iterator. (ZyX)
Added tag v7-4-152 for changeset 2ace11abcfb5