execnet-1.0.9 updated to execnet-1.1
py-1.4.8 updated to py-1.4.15
pytest-2.2.4 updated to pytest-2.3.5
requests-0.11.2 updated to requests-1.2.3
chardet-1.0.1 updated to chardet-2.1.1
Merge pull request #354 from roarange/master

Updated requirements.txt