Stub out Inventory class - we're going to draw heavily on the existing

inventory for implementation

v2/ansible/inventory/__init__.py

+# (c) 2012-2014, Michael DeHaan <michael.dehaan@gmail.com>
+#
+# This file is part of Ansible
+#
+# Ansible is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Ansible is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
+
+#############################################
+
+class Inventory(object):
+    def __init__(self, host_list=C.DEFAULT_HOST_LIST, vault_password=None):
+        pass
+    def get_hosts(self, pattern="all"):
+        pass
+    def clear_pattern_cache(self):
+        pass
+    def groups_for_host(self, host):
+        pass
+    def groups_list(self):
+        pass
+    def get_groups(self):
+        pass
+    def get_host(self, hostname):
+        pass
+    def get_group(self, groupname):
+        pass
+    def get_group_variables(self, groupname, update_cached=False, vault_password=None):
+        pass
+    def get_variables(self, hostname, update_cached=False, vault_password=None):
+        pass
+    def get_host_variables(self, hostname, update_cached=False, vault_password=None):
+        pass
+    def add_group(self, group):
+        pass
+    def list_hosts(self, pattern="all"):
+        pass
+    def list_groups(self):
+        pass
+    def get_restriction(self):
+        pass
+    def restrict_to(self, restriction):
+        pass
+    def also_restrict_to(self, restriction):
+        pass
+    def subset(self, subset_pattern):
+        pass
+    def lift_restriction(self):
+        pass
+    def lift_also_restriction(self):
+        pass
+    def is_file(self):
+        pass
+    def basedir(self):
+        pass
+    def src(self):
+        pass
+    def playbook_basedir(self):
+        pass
+    def set_playbook_basedir(self, dir):
+        pass
+    def get_host_vars(self, host, new_pb_basedir=False):
+        pass
+    def get_group_vars(self, group, new_pb_basedir=False):
+        pass
+