Add basic mail reminder for recurring transactions

Also add some basic accounts to the DB init. Further add dependency to JAXB as it was missing.
Add an optional parameter amount to the recurringTransactions/createTransaction method that can be used to overwrite the amount of the recurring transaction.

pom.xml

@@ -58,6 +58,11 @@
             <artifactId>jollyday</artifactId>
             <version>0.5.7</version>
         </dependency>
+        <!-- TODO maybe set scope to provided when running in tomcat -->
+        <dependency>
+            <groupId>org.glassfish.jaxb</groupId>
+            <artifactId>jaxb-runtime</artifactId>
+        </dependency>
 
         <!-- Runtime dependencies -->
         <dependency>