Add the “accepted” token.

It helps to recognize an invalid escape character, such as: Foo\Bar\Baz,
which is equivalent to Foo\\Bar\\Baz.
Add the getVariable() method.

It helps fluid calls, such as:

    $specification->getClause('requires')
                  ->getVariable('i')
                  ->…;

in addition of:

    $specification->getClause('requires')['i']->…;

which is possible since PHP5.4.
Add the interprete() method & praspel() function.
[auto] Merge from Praspel

    • #43f4ab7 — Add the “accepted” token. (Ivan Enderlin, 2013-02-20)
    • #ee13ce7 — Add the getVariable() method. (Ivan Enderlin, 2013-02-20)
    • #c63b234 — Add the interprete() method & praspel() function. (Ivan Enderlin, 2013-02-20)

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Merge remote branch 'library-praspel/master'