Avoid using scipy for just scoreatpercentile
Fix typo
Added decorators for optional dependencies
Skip over more tests with optional dependencies
Add decorators in glue.qt.widgets.tests
Final changes related to skipping tests with optional dependencies
Added —no-optional-skip option for pytest
Add minimal configuration to Travis
Improve dependencies section of docs
Added back parametrization
Fix syntax in IPYTHON_GT_011_INSTALLED
Added missing astropy import
Fix syntax
Re-enable tests since percentile calculation is done with Numpy now