Fixed a bug with the uri path being encoded

- Fixes #28
Finalized release date
Updated tracker core version
Check for a HttpResponse if it returns null

- We now check if we don't get a response before we try to retrieve a
  status code from it. This fixes a serious issue with the tracker
  crashing on network failure attempts.
- Fixes #32
- Closes #33 since the update to a newer version is already done
Update CHANGELOG
Updated completePayload to take timestamp as a long (closes #35)
Updated auto-generated Version
Finalized date
Added dedicated Vagrant setup (closes #40)
Bumped Core version to 0.2.0 (closes 42)
Updated CHANGELOG with missing tickets (closes #41)
Added Quickstart section to README (closes #43)
Updated auto-generated Version
Added warning that Version.java is auto-generated (closes #45)