yapf + pylint + add style checks to tests

requirements.txt

@@ -1,4 +1,5 @@
 -e git://github.com/mvcisback/hypothesis-cfg@master#egg=hypothesis-cfg
+-e git://github.com/mvcisback/multidim-threshold@master#egg=multidim-threshold
 bitarray==0.8.1
 funcy==1.9.1
 lenses==0.3.0
@@ -7,4 +8,16 @@ parsimonious==0.7.0
 sympy==1.0
 traces==0.3.1
 pytest==3.2.2
-hypothesis==3.30.3
+hypothesis==3.32.1
+
+pytest==3.2.3
+pytest-bpdb==0.1.4
+pytest-cache==1.0
+pytest-colordots==1.1
+pytest-cov==2.5.1
+pytest-flake8==0.9
+pytest-forked==0.2
+pytest-isort==0.1.0
+pytest-pep8==1.0.6
+pytest-xdist==1.20.1
+python-dateutil==2.6.1