v2.0.0

This release of GSP introduces a less-restrictive syntax for ID- and
class shorthands, and breaks compatibility with the previous release.
It also introduces escaping of runes in class names.

Previously, if you attempted the following:

    foo .& {}

You would get:

    <foo class="&">

You now get:

    <foo class="&amp;">

Additionally, as per HTML5 I finally decided to make the ID- and class
shorthand syntax completely unrestrictive.  This means that the
following IDs that were previously not allowed using shorthand syntax
are now allowed:

    $ echo 'foo .{} {}' | gsp -d
    <foo class="{}">

    $ echo 'foo #123 {}' | gsp -d
    <foo id="123">

This breaks backwards compatibility, because of the following:

	gsp v1.0.2
	----------

    $ echo 'foo #bar{}' | gsp -d
    <foo id="bar">

	gsp v2.0.0
	----------

    $ echo 'foo #bar{}' | gsp -d
    gsp: EOF
    $ echo 'foo #bar{} {}' | gsp -d
    <foo id="bar{}">
    $ echo 'foo #bar {}' | gsp -d
    <foo id="bar">
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