Add contants for [CSV-51] Support Unicode line separators.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/csv/trunk@1495914 13f79535-47bb-0310-9956-ffa450edef68

src/main/java/org/apache/commons/csv/Constants.java

@@ -49,5 +49,20 @@ final class Constants {
 
     /** According to RFC 4180, line breaks are delimited by CRLF */
     static final String CRLF = "\r\n";
+    
+    /**
+     * Unicode line separator.
+     */
+    static final String LINE_SEPARATOR = "\u2028";
+
+    /**
+     * Unicode paragraph separator.
+     */
+    static final String PARAGRAPH_SEPARATOR = "\u2029";
+
+    /**
+     * Unicode next line.
+     */
+    static final String NEXT_LINE = "\u0085";
 
 }