Added extensible prompt facility to io.sys and wrote a small unit test
Added extensible request and response for context managers
Applied some pep8 spaces which were lacking
changed request_prompts to prompt_responses
add cross-references from env vars to CLI options
fix inconsistencies in env var to CLI crossrefs
fix a few doc typos and formatting errors
Fix remote command timeout doc
Merge pull request #899 from akitada/fix-remote-command-timeout-doc

Fix remote command timeout doc
Fix remote command timeout doc
Merge branch '1.6'
revert introduction of inconsistent em dash usage
add changelog entry for env var cross-references
Cut 1.6.1 final
Merge branch '1.6'
Push changelog/version changes upstream when releasing
Merge branch '1.6'
Fix #882 - API get() fails for path containing space
Fix support in Python 2.5/2.6
Added a changelog entry for the issue