Add missing dependency

Added missing `aiofiles` to tox.ini and cleaned up requirements files.

requirements-dev.txt

@@ -1,18 +1,18 @@
-httptools
-ujson
-uvloop
-aiohttp
 aiocache
-pytest
-coverage
-tox
-gunicorn
-bottle
-kyoukai
-falcon
-tornado
 aiofiles
+aiohttp
+beautifulsoup4
+bottle
+coverage
+falcon
+gunicorn
+httptools
+kyoukai
+pytest
+recommonmark
 sphinx
 sphinx_rtd_theme
-recommonmark
+tornado
-beautifulsoup4
+tox
+ujson
+uvloop

requirements.txt

@@ -1,4 +1,4 @@
+aiofiles
 httptools
 ujson
 uvloop
-aiofiles

tox.ini

@@ -1,16 +1,16 @@
 [tox]
-
 envlist = py35, py36, flake8
 
-[travis]
 
+[travis]
 python =
     3.5: py35, flake8
     3.6: py36, flake8
 
-[testenv]
 
+[testenv]
 deps =
+    aiofiles
     aiohttp
     pytest
     beautifulsoup4
@@ -18,6 +18,7 @@ deps =
 commands =
     pytest tests {posargs}
 
+
 [testenv:flake8]
 deps =
     flake8