Update dependencies, add sitemap.

requirements-dev.txt

@@ -1,34 +1,38 @@
 -e .[dev]
 alabaster==0.7.10
-arrow==0.10.0
+arrow==0.12.0
+attrs==17.3.0
 babel==2.5.1
 binaryornot==0.4.4
-certifi==2017.7.27.1
+certifi==2017.11.5
 chardet==3.0.4
 click==6.7
 cookiecutter==1.5.1
-coverage==4.4.1
+coverage==4.4.2
 docutils==0.14
 future==0.16.0
 idna==2.6
 imagesize==0.7.1
 jinja2-time==0.2.0
-jinja2==2.9.6
+jinja2==2.10
 markupsafe==1.0
+pluggy==0.6.0
 poyo==0.4.1
-py==1.4.34
+py==1.5.2
 pygments==2.2.0
 pytest-cov==2.5.1
 pytest-sugar==0.8.0
-pytest-timeout==1.2.0
-pytest==3.2.3
+pytest-timeout==1.2.1
+pytest==3.3.1
 python-dateutil==2.6.1
-pytz==2017.2
+pytz==2017.3
 requests==2.18.4
 six==1.11.0
 snowballstemmer==1.2.1
+sphinx-sitemap==0.2
 sphinx==1.6.5
 sphinxcontrib-websupport==1.0.1
 termcolor==1.1.0
 urllib3==1.22
 whichcraft==0.4.1
+yapf==0.20.0