Added 2dgalleries ripper

Closes #96

src/main/java/com/rarchives/ripme/ripper/rippers/TwodgalleriesRipper.java

@@ -0,0 +1,93 @@
+package com.rarchives.ripme.ripper.rippers;
+
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import org.jsoup.nodes.Document;
+import org.jsoup.nodes.Element;
+
+import com.rarchives.ripme.ripper.AbstractHTMLRipper;
+import com.rarchives.ripme.utils.Http;
+
+public class TwodgalleriesRipper extends AbstractHTMLRipper {
+
+    private int offset = 0;
+
+    public TwodgalleriesRipper(URL url) throws IOException {
+        super(url);
+    }
+
+    @Override
+    public String getHost() {
+        return "2dgalleries";
+    }
+    @Override
+    public String getDomain() {
+        return "2dgalleries.com";
+    }
+    
+    @Override
+    public String getGID(URL url) throws MalformedURLException {
+        Pattern p; Matcher m;
+
+        p = Pattern.compile("^.*2dgalleries.com/browse/profile\\?id=([0-9]+).*$");
+        m = p.matcher(url.toExternalForm());
+        if (m.matches()) {
+            return m.group(1);
+        }
+        throw new MalformedURLException(
+                "Expected 2dgalleries.com album format: "
+                        + "2dgalleries.com/browse/profile?id=####"
+                        + " Got: " + url);
+    }
+
+    private String getURL(String userid, int offset) {
+        return "http://en.2dgalleries.com/browse/user-artworks?uid=" + userid
+                      + "&offset=" + offset
+                      + "&ajx=1&pager=1&hr=1&pid=" + userid;
+    }
+
+    @Override
+    public Document getFirstPage() throws IOException {
+        String url = getURL(getGID(this.url), offset);
+        return Http.url(url).get();
+    }
+
+    @Override
+    public Document getNextPage(Document doc) throws IOException {
+        offset += 3;
+        String url = getURL(getGID(this.url), offset);
+        sleep(500);
+        Document nextDoc = Http.url(url).get();
+        if (nextDoc.select(".noartwork").size() > 0) {
+            throw new IOException("No more images to retrieve");
+        }
+        return nextDoc;
+    }
+
+    @Override
+    public List<String> getURLsFromPage(Document doc) {
+        List<String> imageURLs = new ArrayList<String>();
+        for (Element thumb : doc.select("img")) {
+            String image = thumb.attr("src");
+            image = image.replace("/200H/", "/");
+            if (image.startsWith("//")) {
+                image = "http:" + image;
+            } else if (image.startsWith("/")) {
+                image = "http://en.2dgalleries.com" + image;
+            }
+            imageURLs.add(image);
+        }
+        return imageURLs;
+    }
+
+    @Override
+    public void downloadURL(URL url, int index) {
+        addURLToDownload(url, getPrefix(index));
+    }
+}