Fixed the guessing of app_name to allow for @rev in the url
Fixed so that ._exec_fg() reacts on command failure by failing as well.
added arguments to self
moved help_text to base class so can be overriden
moved help_text to base class so can be overriden
sub environ at argparse step
Did some refactoring of the ._call_install() method.
Fixes to the new refactor.
Added tag 0.6 for changeset 8573537a364a
Added tag 0.5 for changeset 98f2d65b4dc3
Bumped up version to 0.6.