BAEL-282 - Grep in Java after code review (#903)

* BAEL-242 Package refactoring after code review for article Grep in Java

* BAEL-282 Updated readme file

core-java/pom.xml

@@ -55,13 +55,13 @@
         <dependency>
             <groupId>org.unix4j</groupId>
             <artifactId>unix4j-command</artifactId>
-            <version>0.4</version>
+            <version>${unix4j.version}</version>
         </dependency>
 
         <dependency>
             <groupId>com.googlecode.grep4j</groupId>
             <artifactId>grep4j</artifactId>
-            <version>1.8.7</version>
+            <version>${grep4j.version}</version>
         </dependency>
         <!-- web -->
 
@@ -100,7 +100,7 @@
         <dependency>
             <groupId>org.projectlombok</groupId>
             <artifactId>lombok</artifactId>
-            <version>1.16.12</version>
+            <version>${lombok.version}</version>
             <scope>provided</scope>
         </dependency>
 
@@ -359,6 +359,9 @@
         <commons-io.version>2.5</commons-io.version>
         <commons-collections4.version>4.1</commons-collections4.version>
         <collections-generic.version>4.01</collections-generic.version>
+        <unix4j.version>0.4</unix4j.version>
+        <grep4j.version>1.8.7</grep4j.version>
+        <lombok.version>1.16.12</lombok.version>
 
         <!-- testing -->
         <org.hamcrest.version>1.3</org.hamcrest.version>