Simplify Travis build for now

.travis.yml

diff --git a/.travis.yml b/.travis.yml
index 0b2a872..c347743 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,11 +2,8 @@
 compiler:
 - clang
 - gcc
-env:
-- COVERAGE=true
-- COVERAGE=false;
+sudo: false
 before_install:
-- sudo pip install cpp-coveralls
 - wget http://www.cmake.org/files/v3.3/cmake-3.3.1-Linux-x86_64.tar.gz  -O /tmp/cmake.tar.gz
 - tar xzf /tmp/cmake.tar.gz
 - export PATH=$PWD/cmake-3.3.1-Linux-x86_64/bin/:$PATH