Starting work on the Sass/CSS-specific lexical patterns.

src/text/lexical_patterns.c

+#include <stdio.h>
+#include "lexical_patterns.h"
+//#include "prefix_primitives.h"
+
+static SEQUENCE_MATCHER(hyphen_and_id, prefix_is_hyphen, prefix_is_identifier);
+static ALTERNATIVES_MATCHER(word_initial, prefix_is_identifier, prefix_is_hyphen_and_id);
+static ALTERNATIVES_MATCHER(word_trailer, prefix_is_identifier, prefix_is_hyphen, prefix_is_digits);
+FIRST_REST_MATCHER(word, prefix_is_word_initial, prefix_is_word_trailer);

src/text/lexical_patterns.h

+#include "prefix_primitives.h"
+
+DECLARE(word);
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