Use tmpdir fixture for deploy unit tests
Use tmpdir to clone snoopy sandbox
Revert tmpdir changes in integration tests
Move cd() call to the low-level wrap-call() function

This commit implies any GitRepository method using a low-level `git ...`
command does not need to care about moving to the right location.
Fix typo
Update copyright dates
Merge pull request #142 from sbesson/118_chdir_decorator

Move cd() call to the low-level wrap-call() function
Merge pull request #136 from sbesson/130_pytest_fixtures

Use more pytest fixtures