Handle invalid or empty pid files instead of returning pid 0
Merge pull request #1 from sodabrew/not_pid_0

Handle invalid or empty pid files instead of returning pid 0
Note the "Handle invalid or empty pid files instead of returning pid 0" fix in the Release file.
Move Daemons::VERSION to lib/daemons/version.rb
First pass through Rubocop for lib/
First pass through Rubocop for examples/