Add default for grabbing an os

If a user does not specify a number of vms with the get command (i.e.
does not include an = sign after the os), the get command will assume
the user just wants 1 vm.

lib/vmfloaty.rb

@@ -41,8 +41,13 @@ class Vmfloaty
         os_types = {}
         args.each do |arg|
           os_arr = arg.split("=")
+          if os_arr.size == 1
+            # assume they didn't specify an = sign if split returns 1 size
+            os_types[os_arr[0]] = 1
+          else
             os_types[os_arr[0]] = os_arr[1].to_i
           end
+        end
 
         no_token = options.notoken