Create base IntegrationTest; move Contact; add Jackson

See merge request !29

for getting random IDs, contacts and for mocking database transactions

Basic API prototype with authentication

See merge request !14

this also stubs a FileManager to show how authorization in the route endpoints could look like

Factor our authentication function from AuthenticationPipeline to prevent confusion about annotated returns from lambda

Add a simple RandomIdManager to generate and validate random IDs

Closes #44

See merge request !25

Some code cleanup

See merge request !23

Store private key of hidden service

Closes #46

See merge request !21

Remove DatabaseComponent and use Database directly

Closes #63

See merge request !20

Create DB dir in subdirectory of mailbox data dir

See merge request !22

Provide the typical dir for storing data

Closes #36

See merge request !18

Basic database setup

Closes #30

See merge request !16