clean up some redundant imports

.checkstyle

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<fileset-config file-format-version="1.2.0" simple-config="true" sync-formatter="false">
+  <fileset name="all" enabled="true" check-config-name="Sun Checks" local="false">
+    <file-match-pattern match-pattern="." include-pattern="true"/>
+  </fileset>
+</fileset-config>

src/com/ichi2/anki/SyncClient.java

@@ -21,34 +21,26 @@
 import android.database.sqlite.SQLiteStatement;
 import android.util.Log;
 
-import org.apache.http.Header;
 import org.apache.http.HttpEntity;
 import org.apache.http.HttpResponse;
-import org.apache.http.StatusLine;
 import org.apache.http.client.ClientProtocolException;
 import org.apache.http.client.methods.HttpPost;
 import org.apache.http.entity.FileEntity;
 import org.apache.http.entity.StringEntity;
 import org.apache.http.impl.client.DefaultHttpClient;
-import org.apache.http.message.BasicHeader;
-import org.apache.http.message.BufferedHeader;
 import org.json.JSONArray;
 import org.json.JSONException;
 import org.json.JSONObject;
 
 import java.io.BufferedOutputStream;
-import java.io.ByteArrayOutputStream;
 import java.io.DataOutputStream;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
-import java.io.OutputStream;
 import java.io.UnsupportedEncodingException;
-import java.net.HttpURLConnection;
 import java.net.MalformedURLException;
-import java.net.URL;
 import java.net.URLEncoder;
 import java.sql.Date;
 import java.util.ArrayList;