v5.2.4-snapshot.8-g27d96e7

Graph

• Linux - fix BlockDevice Chart (sar >=11.5) - plot 'areq-sz' and 'aqu-sz'
• AIX - add run queue and swap queue

BUILD

• adapt Travis build process - fix building openjdk8 twice
• fix Java8 compiler warnings
• fix some issues reported by LGTM

Export

• refactor CSV file creation