Temp commit towards switching from Gson to Jackson.

build.xml

...main/java/org/torproject/onionoo/docs/DateTimeHelper.java

src/main/java/org/torproject/onionoo/docs/DetailsStatus.java

src/main/java/org/torproject/onionoo/docs/DocumentStore.java

...ain/java/org/torproject/onionoo/docs/SummaryDocument.java