Bump to ruby 2.2.2
Bump to ruby 2.2.2

Signed-off-by: Amin Jams <2a8a1939169aaaf7d731bc6f08ed1c227144135f@gmail.com>

thesrinivas/php-buildpack,thesrinivas/php-buildpack,thesrinivas/php-buildpack,thesrinivas/php-buildpack,thesrinivas/php-buildpack,thesrinivas/php-buildpack