Do not require descendant/ancestor paths to exist.
Add a trash path for the tests.
Use lexical binding.
Add page break.
Add f-with-sandbox function.
Refactor tests.
Update README.
Merge branch 'f-guard'
Update Changelog.
Release v0.16.0.
Refactor f-slash.
Fix invalid urls.
Improve doc-string.
Fix f-copy in Emacs 23.

In Emacs 23, the contents is copied, while in Emacs 24, the directory is
copied. We always want the behavior of the latter.
Merge branch 'f-copy-emacs-23'
Release v0.16.1.
Fix invalid f-copy.
Release v0.16.2.
Add f-common-parent
Merge branch 'f-common-parent'