update dev/build/doc requirements

requirements.txt

 alabaster==0.7.9
 Babel==2.3.4
-bleach==1.4.3
-check-manifest==0.33
+bleach==1.5.0
+check-manifest==0.34
 click==6.6
 colorama==0.3.7
 CommonMark==0.5.4
@@ -12,8 +12,8 @@ docutils==0.12
 enum34==1.1.6
 flake8==3.0.4
 funcsigs==1.0.2
-future==0.15.2
-html5lib==0.9999999
+future==0.16.0
+html5lib==0.999999999
 imagesize==0.7.1
 isort==4.2.5
 Jinja2==2.8
@@ -27,20 +27,21 @@ pep8==1.7.0
 pockets==0.3
 py==1.4.31
 pycallgraph==1.0.1
-pycodestyle==2.0.0
+pycodestyle==2.1.0
 pyflakes==1.3.0
 Pygments==2.1.3
-pytest==3.0.2
-pytest-cov==2.3.1
-pytz==2016.6.1
+pytest==3.0.3
+pytest-cov==2.4.0
+pytz==2016.7
 recommonmark==0.4.0
 requests==2.11.1
 responses==0.5.1
 six==1.10.0
 snowballstemmer==1.2.1
-Sphinx==1.4.6
+Sphinx==1.4.8
 sphinx-rtd-theme==0.1.9
 sphinxcontrib-napoleon==0.5.3
 test==2.3.4.5
 traceback2==1.4.0
 unittest2==1.1.0
+webencodings==0.5