Initial Update (#27)

* Pin numpy to latest version 1.13.1

* Pin astropy to latest version 2.0.2

* Pin scipy to latest version 0.19.1

* Pin hypothesis to latest version 3.30.1

* Pin pytest to latest version 3.2.2

* Pin pytest-cov to latest version 2.5.1

* Pin python-coveralls to latest version 2.9.1

requirements.txt

@@ -1,8 +1,8 @@
-numpy
-astropy
-scipy
+numpy==1.13.1
+astropy==2.0.2
+scipy==0.19.1
 #pyastronomy
-hypothesis
-pytest
-pytest-cov
-python-coveralls
+hypothesis==3.30.1
+pytest==3.2.2
+pytest-cov==2.5.1
+python-coveralls==2.9.1