v0.4

Changes since last version:
- Bugfix: fixed an issue when using update with freezed deps
- Bugfix: fixed an issue when updating with a remotely deleted (merged) branch : changed the order of pull and checkout
- Feature: support for autostashing during update
- Feature: fetch and rebase instead of pull
- Feature: display newly integrated commits during update
- Feature: Selectively freeze, unfreeze, update dependencies