Use original Span class and implement Tokenizer interface from OpenNLP

Using maven assembly plugin to include the required classes into a jar
for binary distribution.

This makes it possible to use KorAPTokenizerImpl as tokenizer in OpenNLP
applications.

Change-Id: I627dcdd046334db1b1ae9dd60cf7104fd3a3c518
diff --git a/src/assembly/src-distribution.xml b/src/assembly/src-distribution.xml
new file mode 100644
index 0000000..675c51e
--- /dev/null
+++ b/src/assembly/src-distribution.xml
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<assembly xmlns="http://maven.apache.org/ASSEMBLY/2.1.0"
+          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+          xsi:schemaLocation="http://maven.apache.org/ASSEMBLY/2.1.0 http://maven.apache.org/xsd/assembly-2.1.0.xsd">
+    <id>src</id>
+    <formats>
+        <format>zip</format>
+    </formats>
+    <fileSets>
+        <fileSet>
+            <directory>${project.basedir}</directory>
+            <includes>
+                <include>README*</include>
+                <include>Readme*</include>
+                <include>LICENSE*</include>
+                <include>NOTICE*</include>
+                <include>pom.xml</include>
+            </includes>
+            <useDefaultExcludes>true</useDefaultExcludes>
+        </fileSet>
+        <fileSet>
+            <directory>${project.build.sourceDirectory}/src</directory>
+            <useDefaultExcludes>true</useDefaultExcludes>
+        </fileSet>
+    </fileSets>
+</assembly>