upgrade to jedis 2.7.2 for grails2 branch

[wmacgyver]

I notice the grails2 branch is still using jedis 2.6, would be great to bump it to 2.7.2

[sandhyamurugesan]

Have modified this plugin to work with grails 2.4.3 with TTL and recent version of jedis. Kindly try the below and lemme know in-case of any issues.
https://github.com/sandhyamurugesan/grails-cache-redis