Changing coveralls install permissions.
trying sudo install coveralls
Removed duplicate commands
Only running coveralls on one linux build job.

There's no point running it twice, and the OSX environment seems to have
changed, so installing coveralls isn't working anymore. I've updated the
build config to only install and run coveralls on Linux Py2.7 clang,
which still seems to be working.

I also noticed that the echo commands were not showing the names the
scripts properly within Travis, so I hand-jammed the names into the
scripts so I can better see what scripts are actually being executed.
Dammit, forgot to cd into the right dir
Merge pull request #1506 from rhyolight/fix-coveralls

Fixes coveralls installation.