Adding default on vars_prompt
Move default arguments to the end of the function call.
add when_changed when_failed examples to docsite

whitespace fix
Merge pull request #1883 from tgerla/devel

--private-key tilde handling
Merge pull request #1881 from fdavis/when_changed_fail

add when_changed when_failed example to docsite
Merge pull request #1875 from cocoy/vars_prompt_default

Adding default on vars_prompt