[CSV-168] CsvFormat.nullString should not be escaped. [CSV-170]

CSVFormat.MYSQL nullString should be "\N".

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/csv/trunk@1725408 13f79535-47bb-0310-9956-ffa450edef68

Author: garydgregory

pom.xml

@@ -45,6 +45,12 @@ CSV files of various types.
       <version>2.4</version>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>org.apache.commons</groupId>
+      <artifactId>commons-lang3</artifactId>
+      <version>3.4</version>
+      <scope>test</scope>
+    </dependency>
     <dependency>
       <groupId>com.h2database</groupId>
       <artifactId>h2</artifactId>