Experiment with travis to get number of cores.

.travis.yml

@@ -10,17 +10,8 @@ matrix:
       env: OS_NAME=Darwin
       osx_image: xcode9.2
 
-before_install:
-  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y && sudo apt-get update && sudo apt-get install -y g++-7; fi
-  - git submodule update --init --recursive
-
 script:
-  - export VERSION=`echo "$(git tag -l --points-at HEAD)"`
-  - mkdir build && cd build
-  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then cmake -DMM_VERSION="$VERSION" -DCMAKE_C_COMPILER=/usr/bin/gcc-7 -DCMAKE_CXX_COMPILER=/usr/bin/g++-7 ..; fi
-  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then cmake -DMM_VERSION="$VERSION" ..; fi
-  - cmake --build . --target marketmaker-mainnet
-  - cmake --build . --target marketmaker-testnet
+  - nproc --all
 
 cache:
   apt: true