Various stuff all over the tree

- Increase Java version to 1.9
- Add commons-collection and Jollyday dependencies
- Add JavaDoc plugin
- Add country and state configuration for Jollyday library
- Add WIP implementation of the recurring transaction feature
- Improve JavaDoc
- Use Java 8 date API
- Reformatting
- Add special Flyway migration version for test data
- Add and improve unit tests

pom.xml

@@ -20,9 +20,9 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <maven.compiler.source>1.8</maven.compiler.source>
-        <maven.compiler.target>1.8</maven.compiler.target>
-        <java.version>1.8</java.version>
+        <maven.compiler.source>1.9</maven.compiler.source>
+        <maven.compiler.target>1.9</maven.compiler.target>
+        <java.version>1.9</java.version>
     </properties>
 
     <dependencies>
@@ -46,7 +46,17 @@
         <dependency>
             <groupId>org.apache.commons</groupId>
             <artifactId>commons-lang3</artifactId>
-            <version>3.8.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-collections4</artifactId>
+            <version>4.3</version>
+        </dependency>
+        <!-- Misc dependencies -->
+        <dependency>
+            <groupId>de.jollyday</groupId>
+            <artifactId>jollyday</artifactId>
+            <version>0.5.7</version>
         </dependency>
 
         <!-- Runtime dependencies -->
@@ -99,6 +109,19 @@
         </plugins>
     </build>
 
+    <reporting>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-javadoc-plugin</artifactId>
+                <configuration>
+                    <show>private</show>
+                    <javadocExecutable>/usr/bin/javadoc</javadocExecutable>
+                </configuration>
+            </plugin>
+        </plugins>
+    </reporting>
+
     <profiles>
         <profile>
             <id>integration-tests</id>