Change related import to absoluate.

Otherwise calling commands like "python -m iris.manage syncdb" may
failed to import module "core.views".

  File
"site-packages/django/core/urlresolvers.py",
line 100,
in get_callable
    not module_has_submodule(import_module(parentmod), submod)):
  File
"site-packages/django/utils/importlib.py",
line 40, in
import_module
    __import__(name)
ImportError: No module named core.views

Change-Id: Ic3d62447339d26ada3dabb252ca9b3cf9145648f
Add travis yaml

Travis CI is online CI service integrated very well with github.

This yaml file is the config file to tell travis how to do.

Change-Id: I19e968e9a740ef076818a473c63d182fcc27ab9d
Signed-off-by: Huang Hao <hao.h.huang@intel.com>