Fix NLopt build

[pbastide]

• Tweak .travis.ylm to install libnlopt0 before hand (for linux build)
• Remove call to master branch for osx (not needed anymore since last release of NLopt).

[codecov]

Codecov Report

Merging #73 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master     #73   +/-   ##
======================================
  Coverage    74.7%   74.7%           
======================================
  Files          22      22           
  Lines        8299    8299           
======================================
  Hits         6200    6200           
  Misses       2099    2099

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[cecileane]

Hi Claudia, could you possibly double-check the set-up for Codecov.io and Coveralls for PhyloNetworks? It seems simple based on these instructions, from Codecov and for Coveralls. I modified the travis file to use the coverage scripts created by PkgDev.generate().

[crsl4]

Sorry Cecile, not sure what you want me to do. We have enabled Codecov access to the PhyloNetworks repo. Actually, in my Codecov, there is a collaborators section that I had not seen:

Collaborators
Codecov uses GitHub permissions to authenticate users. No setup necessary.
Ask your team members to login to Codecov and they will have read/write access to the appropriate repositories.

We do not have Coveralls setup for PhyloNetworks, because I thought it was either Codecov or Coveralls (not both). I don't understand what specifics about the set-up would you like me to check. Please let me know!