Merge pull request #454 from PurpleI2P/Travis_fixes

Adding working Travis build config for Linux Clang + OS X Clang / GCC

.travis.yml

@@ -3,6 +3,7 @@ cache:
   apt: true
 os:
   - linux
+  - osx
 sudo: required
 dist: trusty
 addons:
@@ -23,6 +24,11 @@ addons:
       - libssl-dev
 compiler:
   - gcc
+  - clang
+before_install:
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew update ; fi
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install openssl miniupnpc ; fi
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew unlink boost openssl && brew link boost openssl -f ; fi
 env:
   matrix:
     - BUILD_TYPE=Release UPNP=ON