Updates to Plugin Standard

[Sebastian Gniazdowski <sgniazdowski@xxxxxxxxx>]

Hi,
recently, I've added a few meaningful sections to the plugin standard
(available at
http://zdharma.org/Zsh-100-Commits-Club/Zsh-Plugin-Standard.html):

1. A section on a new directory called `functions' that is to hold
autoloadables,

2. A section that advises to name hashes like MyHash, Hash, etc. – i.e.:
with the capitalization (extending the current unwritten convention of
naming scalars uppercase and arrays lowercase; this convention is also
mentioned in the document),

3. A section advising to use a `Plugins' hash to store all the plugin data,

4. A section on a new global parameter `PMSPEC' that is to hold the
capabilities of the plugin manager.

-- 
Sebastian Gniazdowski
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