Release 1.2.0

Features:
- Add geppetto `.project` natures
- Add GH auto-release
- Add `apt::key::key_options` parameter
- Add complex pin support using distribution properties for `apt::pin` via new properties:
  - `apt::pin::codename`
  - `apt::pin::release_version`
  - `apt::pin::component`
  - `apt::pin::originator`
  - `apt::pin::label`
- Add source architecture support to `apt::source::architecture`

Bugfixes:
- Use apt-get instead of aptitude in apt::force
- Update default backports location
- Add dependency for required packages before apt-get update
Merge pull request #141 from hunner/release_1.2.0

Release 1.2.0
proxy support for apt::ppa
Adding specs for proxy and apt::ppa
Merge pull request #144 from hunner/ppa_proxy

Ppa proxy
Fix: apt::ppa options parameter to pass options to apt-add-repository command
Fix: ppa options support specs
Merge pull request #146 from botify-labs/handle_ppa_options

Fix: parametrize apt::ppa class for beign able to pass options to apt-add-repository command
pass flags as string of single letter
Merge pull request #148 from futuresimple/fix/ppa/pass_flags_as_single_character

pass flags as string of single letter