Add current items and evictions graphs of memcached
Add prediction line to disk usage graph
Add prediction line to InnoDB tablespace free graph
Merge pull request #31 from hirose31/feature/improve-memcached

Add current items and evictions graphs of memcached
Merge pull request #32 from hirose31/feature/predict-innodbtablespace

Add prediction line to InnoDB tablespace free graph
Merge pull request #33 from hirose31/feature/predict-diskusage

Add prediction line to disk usage graph