LAME transcoder tool flags configuration

Adds a new 'lame_flags' configuration name for allowing the user to tune
his/her MP3 generation when using the media features, adding it to the
second tab of the configuration screen.
Add support for tokenizing configuration values

This will come in handy with lame_flags, as that needs to return a list
when it is actually used with service implementations.
Pass LAME flags via Popen call

Adjusts the implementations of eSpeak, Mac OS X Say, and SAPI to pass
the configured command-line flags to the LAME transcoder tool.
Copyright bump

Updates the boilerplate legal copy at the top of the configurator UI
form specification.
Remove dead constant from main module

The maximum file length stuff actually lives (and is used in) the util
module, rather than the main module.
Merge branch 'add/config-lame' into develop

Allows the user to configure which flags and options are passed to the
LAME transcoder for services the convert between different file formats.
The option is available on the second tab of the configuration screen.

Services that download an MP3 directly from a service, e.g. Google, will
be unaffected by this change.