used maven instead of the wrapper for the CI

.travis.yml

@@ -1,11 +1,10 @@
 language: java
 install: true
-before_install:
- - chmod +x mvnw
+
 script:
-- mvnw compile
-- mvnw package
-- mvnw test
-- mvnw install
+- mvn compile
+- mvn package
+- mvn test
+- mvn install
 jdk:
   - oraclejdk8

src/test/java/io/github/ghacupha/keeper/book/EmoneyTest.java → src/test/java/io/github/ghacupha/keeper/book/CashTest.java

@@ -1,13 +1,20 @@
 package io.github.ghacupha.keeper.book;
 
+import io.github.ghacupha.keeper.book.unit.money.Cash;
+import io.github.ghacupha.keeper.book.unit.money.HardCash;
 import org.junit.Before;
 import org.junit.Test;
 
 import static org.junit.Assert.*;
 
-public class EmoneyTest {
+public class CashTest {
+
+    private Cash cash;
+
     @Before
     public void setUp() throws Exception {
+
+        cash = HardCash.shilling(106.50);
     }
 
     @Test