add exceptions

employ/exceptions.py

@@ -0,0 +1,16 @@
+class EmployError(Exception):
+    """
+    Base Employ Exception
+    """
+
+
+class ExecutionError(EmployError):
+    """
+    Error when executing a command
+    """
+
+
+class SSHConnectionError(EmployError):
+    """
+    Could not connect to EC2 Instance with SSH
+    """

employ/managers/__init__.py

@@ -1,6 +1,8 @@
 from pkgutil import extend_path
 __path__ = extend_path(__path__, __name__)
 
+from employ.execptions import ExecutionError
+
 
 class Manager(object):
     name = "manager"

employ/managers/ec2.py

@@ -3,6 +3,7 @@ import time
 import boto.ec2
 from boto.manage.cmdshell import sshclient_from_instance
 
+from employ.exceptions import SSHConnectionError
 from employ.managers import Manager