Make all top level commands singular

vultron/cmds/__init__.py

@@ -1,2 +1,4 @@
 # FIXME: build this dynamically
-__all__ = ["account", "help", "regions", "vpcs"]
+__all__ = [
+  "account", "application", "backup", "billing", "help", "region", "vpc"
+]

vultron/cmds/application.py

@@ -1,6 +1,6 @@
 import vultron.cmd
 
-class Applications(vultron.cmd.Command):
+class Application(vultron.cmd.Command):
   def init(self):
     self.needs_api_key = False
 

vultron/cmds/backup.py

@@ -1,6 +1,6 @@
 import vultron.cmd
 
-class Backups(vultron.cmd.Command):
+class Backup(vultron.cmd.Command):
   def vultron_list(self):
     """Display all stored snapshots."""
 

vultron/cmds/region.py

@@ -1,7 +1,7 @@
 import vultron.cmd
 import vultron.display
 
-class Regions(vultron.cmd.Command):
+class Region(vultron.cmd.Command):
   """Query for information on Vultr regions."""
 
   def init(self):

vultron/cmds/vpc.py

@@ -1,7 +1,7 @@
 import vultron.cmd
 import vultron.display
 
-class Vpcs(vultron.cmd.Command):
+class Vpc(vultron.cmd.Command):
   """Query for information on VPCs."""
 
   def vultron_list(self):