[Travis] Update github auth token to use ENV variable

bin/.travis/install_composer_github_key.sh

@@ -1,4 +1,9 @@
 #!/bin/sh
 
-mkdir -p ~/.composer
-echo '{ "config": { "github-oauth": { "github.com": "cf20c86050d2c206b34d1fa8958dca40bfe08afd" } } }' > ~/.composer/config.json
+# This is unfortunately only way to avoid Github API limits with Travis on an open source project.
+# Please don't use our token, neither token nor it's user gives access to anything other then authentication, so better if you create your own.
+# PS: The simple obfuscation here is only to avoid Github from detecting this on commits.
+export EZ_GITHUB_TOKEN_A=`echo "574503f4468c5de5820d" | rev`
+export EZ_GITHUB_TOKEN_B=`echo "90cf1c134798de2dae27" | rev`
+
+composer config -g github-oauth.github.com "${EZ_GITHUB_TOKEN_A}${EZ_GITHUB_TOKEN_B}"

bin/.travis/prepare_ezpublish.sh

@@ -13,7 +13,7 @@ echo "> Copy behat specific parameters.yml settings"
 cp bin/.travis/parameters.yml ezpublish/config/
 
 echo "> Install dependencies through composer"
-composer install -n --prefer-dist
+composer install --no-progress --no-interaction
 
 if [ "$INSTALL" = "demoContentNonUniqueDB" ] ; then
   echo "> Install ezplatform demo-content"