Update intro.rst: search --all no longer works
Merge pull request #288 from Juanlu001/patch-1

Update intro.rst: search --all no longer works
better naming of source directory
update help text to refer to conda
remove out-of-date file
add cloning existing local environments to CLI (functionality not implemented yet)
typo in docstring
move conda_installed_files() away from builder sub-module
reorganize code related to package command
implement cloning set of packages
minor simplification
add hard-linking or copying of untracked files
add updating of prefix in files
always copy file
reduce verbosity
better error handling
adding --clone option to create command
add common utility function and name to root environment
add new CLI logic to create --clone option
update changelog