Update venv pickle files fixing tox tests

The pickle files for test virtualenv data were created using an older
version of pip. As tox started using the newer version of pip, these
files were obsolete and it lead to failure of tests run via tox. This is
now fixed by regenerating the pickle files for pip ver. 6.0.8

tests/virtualenvs/cyclic_deps.pickle

@@ -13,14 +13,14 @@ Rp5
 (dp6
 S'project_name'
 p7
-S'CircularDependencyA'
+S'CircularDependencyB'
 p8
 sS'precedence'
 p9
 I-1
 sS'_key'
 p10
-S'circulardependencya'
+S'circulardependencyb'
 p11
 sS'_version'
 p12
@@ -30,7 +30,7 @@ sS'platform'
 p14
 NsS'location'
 p15
-S'.tox/cyclic_deps/lib/python2.7/site-packages'
+S'/home/vineet/python/projects/pipdeptree/.tox/cyclic_deps/lib/python2.7/site-packages'
 p16
 sS'py_version'
 p17
@@ -47,7 +47,7 @@ p22
 g16
 sS'egg_info'
 p23
-S'.tox/cyclic_deps/lib/python2.7/site-packages/CircularDependencyA-0.0.0-py2.7.egg-info'
+S'/home/vineet/python/projects/pipdeptree/.tox/cyclic_deps/lib/python2.7/site-packages/CircularDependencyB-0.0.0-py2.7.egg-info'
 p24
 sbsbag1
 (g2
@@ -56,12 +56,12 @@ Ntp25
 Rp26
 (dp27
 g7
-S'CircularDependencyB'
+S'CircularDependencyA'
 p28
 sg9
 I-1
 sg10
-S'circulardependencyb'
+S'circulardependencya'
 p29
 sg12
 S'0.0.0'
@@ -80,6 +80,6 @@ p32
 g22
 g16
 sg23
-S'.tox/cyclic_deps/lib/python2.7/site-packages/CircularDependencyB-0.0.0-py2.7.egg-info'
+S'/home/vineet/python/projects/pipdeptree/.tox/cyclic_deps/lib/python2.7/site-packages/CircularDependencyA-0.0.0-py2.7.egg-info'
 p34
 sbsba.