Fix Flask and Eve dependency issue

Eve expects 'flask>=0.10.1,<=0.12' so we can't use flask==0.12.2 in
pillar for now.

This needs to be fixed upstream (eve), but for now `python setup.py
install`.

requirements.txt

@@ -10,7 +10,7 @@ bleach==1.4.3
 celery[redis]==4.0.2
 CommonMark==0.7.2
 Eve==0.7.3
-Flask==0.12.2
+Flask==0.12
 Flask-Cache==0.13.1
 Flask-Script==2.0.5
 Flask-Login==0.3.2

setup.py

@@ -9,7 +9,7 @@ setuptools.setup(
     version='2.0',
     packages=setuptools.find_packages('.', exclude=['test']),
     install_requires=[
-        'Flask>0.12',
+        'Flask>=0.12',
         'Eve>=0.7.3',
         'Flask-Cache>=0.13.1',
         'Flask-Script>=2.0.5',