Update README.md

Add travis build status for *jitsu* to monitor
Lazy load script/lib icons
Small adjustment to make it even less blocking;
Fix missing icons;
Update CONTRIBUTING.md

@sizzlemctwizzle 

Added "needs mitigation" label ... I think this label will do let me know if it doesn't.
Update CONTRIBUTING.md

Add in note about non-blocking and, of course, the originator of the label can remove it.
Fix one of nodejitsu's deploy failure by failing to follow semver

* Downbump requested engine support
Merge branch 'master' into fixNodejitsuSemverFailure
Merge pull request #452 from Martii/fixNodejitsuSemverFailure

Fix nodejitsu semver failure

Auto-merge
Merge pull request #449 from jerone/lazy-icons

Lazy load script/lib icons

Merge