fix: can't install in leanengine

[aisk]

怀疑在低版本 pip 下目前的 setup.py 中依赖 leancloud 会出现依赖问题，紧急发布一个版本改回以前的 setup.py 格式。

报错信息：

4/26/2016, 6:32:55 PM [ERROR] 部署失败：Requirement already satisfied (use --upgrade to upgrade): gevent>=1.0.2 in /usr/local/lib/python2.7/dist-packages (from -r requirements.txt (line 1)) Requirement already satisfied (use --upgrade to upgrade): gevent-websocket>=0.9.5 in /usr/local/lib/python2.7/dist-packages (from -r requirements.txt (line 2)) Downloading/unpacking leancloud-sdk>=1.4.2 (from -r requirements.txt (line 3)) Downloading leancloud-sdk-1.4.2.tar.gz Running setup.py (path:/tmp/pip_build_root/leancloud-sdk/setup.py) egg_info for package leancloud-sdk Traceback (most recent call last): File "<string>", line 17, in <module> File "/tmp/pip_build_root/leancloud-sdk/setup.py", line 4, in <module> import leancloud File "/tmp/pip_build_root/leancloud-sdk/leancloud/__init__.py", line 18, in <module> from . import client File "/tmp/pip_build_root/leancloud-sdk/leancloud/client.py", line 14, in <module> from leancloud import utils File "/tmp/pip_build_root/leancloud-sdk/leancloud/utils.py", line 14, in <module> import arrow ImportError: No module named arrow Complete output from command python setup.py egg_info: Traceback (most recent call last): File "<string>", line 17, in <module> File "/tmp/pip_build_root/leancloud-sdk/setup.py", line 4, in <module> import leancloud File "/tmp/pip_build_root/leancloud-sdk/leancloud/__init__.py", line 18, in <module> from . import client File "/tmp/pip_build_root/leancloud-sdk/leancloud/client.py", line 14, in <module> from leancloud import utils File "/tmp/pip_build_root/leancloud-sdk/leancloud/utils.py", line 14, in <module> import arrow ImportError: No module named arrow ---------------------------------------- Cleaning up...