Add support for YAML format configuration files. In addition, this
commit adds instructions about YAML config files to the README, and it
also changes the README to encourage use of YAML instead of JSON.
This commit introduces an additional option for extended configuration
syntax for linking. It adds the "create" parameter which results in
automatically creating a parent directory if necessary before linking a
file.
This commit introduces an extended configuration syntax for linking
files and directories. Currently, this syntax allows for specifying
items to be forcibly linked, overwriting existing files or directories
if necessary.
The extended configuration syntax was proposed by Travers McInerney
<travers@mcinerney.me>.
When failing to symbolically linking files, display the names of the
files that could not be linked. This makes it easier to troubleshoot the
error without having to manually figure out which files failed to link.
Linker now reports an error when links are configured to point to
nonexistent targets. This fixes the old behavior where Linker silently
created invalid links.
According to PEP 394, `python` should only be used in the shebang line
for scripts that are source compatible with both Python 2 and Python 3.
In previous versions of Dotbot, on certain systems where `python`
referred to `python3`, running Dotbot would throw an exception due to a
SyntaxError. This can be fixed by making Dotbot source compatible with
both Python 2 and Python 3.
