Travis failure should break the build

[manodeep]

General information

• Corrfunc version: 2.3.3
• platform: osx/linux
• installation method (pip/source/other?):NA

Issue description

An intermediate step in python setup.py install fails, but the overall build still appears to succeed

Expected behaviour

If any stage of the Travis build fails, the entire build should terminate and return a failed status

Actual behaviour

Travis does not fail the build

What have you tried so far?

N/A

Minimal failing example

See the Travis build log here

[manodeep]

That specific issue was a warning, but will be fixed nonetheless in #215

[manodeep]

Fixed the missing abiflags in py2 in #215