fix sklearn in requirements

Author: maclandrol

.travis.yml

@@ -23,7 +23,7 @@ before_install:
   - pip install --upgrade pip
   - pip install pep8
 install: 
-  - pip install -r requirements.txt
+  - cat requirements.txt | xargs -n 1 -L 1 pip install
   - python setup.py install
 # command to run tests
 script: 

requirements.txt

@@ -2,9 +2,9 @@ PyYAML
 numpy>=1.8.1
 pandas>=0.16.1
 scipy>=0.14.0
-scikit-learn>=0.17b1,<=0.17.1
+scikit-learn==0.17
 matplotlib>=1.5.1
 biopython>=1.65
 ete3
 WeasyPrint
-seaborn
+seaborn