Moved rules into their own files

Everything under `lib/rules/*` is a rules file (with the name of the rule in camelCase), re-exported into an array in `lib/rules.js`.
Moved the regular expressions from `lib/rules.js` to `lib/expressions.js`, and the rest of the variables into `lib/shared.js`.

lib/rules/noInlineHtml.js

@@ -0,0 +1,37 @@
+var expressions = require("../expressions");
+var shared = require("../shared");
+
+module.exports = {
+  "name": "MD033",
+  "desc": "Inline HTML",
+  "tags": [ "html" ],
+  "aliases": [ "no-inline-html" ],
+  "regexp": expressions.htmlRe,
+  "func": function MD033(params, errors) {
+    var allowedElements = (params.options.allowed_elements || [])
+      .map(function forElement(element) {
+        return element.toLowerCase();
+      });
+    function forToken(token) {
+      token.content.split(shared.newLineRe)
+        .forEach(function forLine(line, offset) {
+          var allowed = (line.match(/<[^/\s>!]*/g) || [])
+            .filter(function forElement(element) {
+              return element.length > 1;
+            })
+            .map(function forElement(element) {
+              return element.slice(1).toLowerCase();
+            })
+            .filter(function forElement(element) {
+              return allowedElements.indexOf(element) === -1;
+            });
+          if (allowed.length) {
+            errors.addDetail(token.lineNumber + offset,
+              "Element: " + allowed[0]);
+          }
+        });
+    }
+    shared.filterTokens(params, "html_block", forToken);
+    shared.forEachInlineChild(params, "html_inline", forToken);
+  }
+};