Allow parsing of more number types

Fixes #7

Author: dampcake

src/main/java/com/dampcake/bencode/BencodeInputStream.java

@@ -21,6 +21,7 @@
 import java.io.InputStream;
 import java.io.InvalidObjectException;
 import java.io.PushbackInputStream;
+import java.math.BigDecimal;
 import java.nio.ByteBuffer;
 import java.nio.charset.Charset;
 import java.util.ArrayList;
@@ -198,7 +199,7 @@ public Long readNumber() throws IOException {
             buffer.append((char) token);
         }
 
-        return Long.parseLong(buffer.toString());
+        return new BigDecimal(buffer.toString()).longValue();
     }
 
     /**

src/test/java/com/dampcake/bencode/BencodeInputStreamTest.java

@@ -243,6 +243,13 @@ public void run() throws Exception {
         assertEquals(0, instance.available());
     }
 
+    @Test
+    public void testReadNumberScientificNotation() throws Exception {
+        instantiate("i-2.9155148901435E+18e");
+
+        assertEquals(-2915514890143500000L, instance.readNumber().longValue());
+    }
+
     @Test
     @SuppressWarnings("unchecked")
     public void testReadList() throws Exception {