Relatively minor cleanups to the main doc entry point
Move list of programs above key spec summary

The key spec summary isn't necessary to get started, while the list of
programs is useful to showcase how recs slices and dices.
Correct typo
Installation instructions, two ways
Document the recs command and how to invoke scripts
Flesh out how to extend recs with your own commands
Correct typo in example and clarify what kind of access log
Refer to operations as commands, not scripts

This standardizes on `recs command` invocation for App::RecordStream
POD.
Remove outdated alternative packaging/installation support files

The tarball and .deb packages have not been maintained for a while, and
the fatpacked recs is a more modern, easier solution for a quick
install.
Update README and other generated files with dzil update
bin/recs: refer to operations as commands for consistency
Reformat and cleanup the examples doc
Add a help command to display all command and option/arg help

It doesn't add much value over `recs command --help`, but it does enable
all extended help options on one command.  This means you don't need to
know that --help-clumping only works on the collate and multiplex
commands, for example.

This new command also enables other "documentation commands" via
subclassing (e.g. moving the examples doc into `recs examples`).

The croak in accept_line should catch if something attempts to send the
help command input.
Suppress filename key option from the help op, which doesn't support it

Other operations don't support it either, but I'm leaving them as-is for
now since it may not be as clear-cut.

If we start using roles to compose our operation classes at some point
(which would be sweet!), the does_record_output method would easily
translate to something like:

    $this->DOES("App::RecordStream::Stream::Output::Records");
Provide the examples and story doc as linkable perldoc and help commands

The two documents are still provided as man pages too when installing
from CPAN.  Providing the doc as classes means that local perldoc(1)
works and websites like metacpan.org and search.cpan.org will link them
correctly on the web (instead of to manpage sites which don't have the
recs manpages).  Meanwhile, providing the help commands `recs examples`
and `recs story` means that fatpack users still have local access to the
examples and story.

It's possible that the overview doc in App::RecordStream should also be
available via a help command, but users are more likely to find that
first on the web (via a CPAN site or Github README).

Generated files are updated in the next commit so that they don't muddy
the diff of this commit.
Update generated files with dzil update --trial
Merge pull request #54 from benbernard/doc-improvements

Documentation improvements