Added Slack notifications to travis conf.
Added Slack notifications to travis conf.

SandstoneHPC/OIDE,ResearchComputing/OIDE,ResearchComputing/OIDE,SandstoneHPC/OIDE,SandstoneHPC/OIDE,SandstoneHPC/sandstone-ide,SandstoneHPC/sandstone-ide,ResearchComputing/OIDE,SandstoneHPC/sandstone-ide,ResearchComputing/OIDE