Update Installation section of readme with Dist::Zilla build commands

As best I understand it, Dist::Zilla replaces the make stuff entirely,
so the readme should reflect that.
Remove manifest.t, as Dist::Zilla handles all of that
Clarify execute_async_script docs regarding callback execution

`execute_async_script` doesn't ever call this Perl callback. Even
though it's passed in as the last argument to our
execute_async_script, it isn't actually the last argument in the
context of the executed javascript. The callback that gets executed in
the async script is generated by Selenium and appended to the argument
list. So, previously the argument list looked something like:

    ["myid", "return arguments[0];", $automatic_callback]

But, the example in the docs happened to work as written because the
automatic Javascript callback just returns its argument, and that
happens to be the same thing that the Perl callback was trying to do.

The chromium implementation of [execute_async_script.js][1] can
probably explain it better than I can.

[1]: https://code.google.com/p/chromium/codesearch#chromium/src/chrome/test/chromedriver/js/execute_async_script.js&q=reportValue&sq=package:chromium&l=65
Fix incorrect use of execute_async_callback in 01-driver.t
Merge pull request #81 from gempesaw/async-script-callback

Fix async script callback docs and tests
Merge pull request #75 from gempesaw/misc-from-mb-to-dzil

Clean up some forgotten items in the transition from make to dzil
Fix 1/0 vs "true"/"false" errors in tests
Add easier way to generate recordings
Add OS X recordings for b36b317 (test-SRD tests failing :()
Coerce LWP::Protocol::PSGI version

Its behavior changed (drastically?) between 0.06 and 0.04; we need 0.04
to properly generate the entire recordings suite.
Update meta resources with new repo
Use dzil AutoPrereqs plugin

Conflicts:
	dist.ini
Handle encoding issues brought about by dist zilla v5
migrated Selenium::Remote::RemoteConnection to Moo
Migrated Selenium::Remote::ErrorHandler to Moo
Migrated Selenium::Remote::Commands and fixed the tests accordingly
Migrated Selenium::Remote::WebElement to Moo
Migrated Selenium::Remote::Driver to Moo
added coercion, and removed the call to get_ok in the tests (wont work)
Added an effing handle, so clean