Avoid relative path to composer vendor bin in travis tests

Author: David Alger

dev/travis/before_script.sh

@@ -74,6 +74,7 @@ echo 'memory_limit = -1' >> ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d
 phpenv rehash;
 
 # install deps
+export COMPOSER_BIN_DIR=~/bin
 if [[ -n "$GITHUB_TOKEN" ]]; then
     composer config github-oauth.github.com "$GITHUB_TOKEN"
 fi

dev/travis/script.sh

@@ -4,7 +4,7 @@
 # See COPYING.txt for license details.
 
 set -e
-export PATH="./../../../vendor/bin:$PATH"
+export PATH="~/bin:$PATH"
 
 case $TEST_SUITE in
     unit)