automatically install extensions required by dependencies
harden against undefined keys
move common.sh to util dir
factor out special newrelic handling
error out if composer.phar isn't executable
Merge branch 'develop' into refactor_special_exts
fix exts var access in function
Merge branch 'refactor_special_exts' into develop
fix PHP 5.6.3 build :(
PHP/5.6.4RC1
Added blackfire deploy steps
Merge pull request #94 from deguif/blackfire_refactor_specials_exts

Add blackfire install on heroku
Merge remote-tracking branch 'parentrepo/master'