Remove version caps on sqlalchemy and alembic.

Code seems to pass fine after the cap is removed.  Whatever dependency
issues we were running into before don't seem to be an issue now.

guix-env.scm

@@ -128,7 +128,7 @@
     (native-inputs
      `(("python-pytest" ,python-pytest)))
     (propagated-inputs
-     `(("python-alembic" ,python-alembic-0.6.6)
+     `(("python-alembic" ,python-alembic)
        ("python-pytest-xdist" ,python-pytest-xdist)
        ("python-celery" ,python-celery)
        ("python-kombu" ,python-kombu)
@@ -155,7 +155,7 @@
        ("python-six" ,python-six)
        ("python-sphinx" ,python-sphinx)
        ("python-docutils" ,python-docutils)
-       ("python-sqlalchemy" ,python-sqlalchemy-0.9.10)
+       ("python-sqlalchemy" ,python-sqlalchemy)
        ("python-unidecode" ,python-unidecode)
        ("python-werkzeug" ,python-werkzeug)
        ("python-exif-read" ,python-exif-read)

setup.py

@@ -49,7 +49,7 @@ if PY2:
 
 install_requires = [
     'waitress',
-    'alembic==0.6.6',
+    'alembic',
     'python-dateutil',
     'wtforms',
     'py-bcrypt',
@@ -63,7 +63,7 @@ install_requires = [
     'WebTest>=2.0.18',
     'ConfigObj',
     'Markdown',
-    'sqlalchemy<1.1.0, >0.9.9',
+    'sqlalchemy',
     'itsdangerous',
     'pytz',
     'sphinx',