Update author date again

[campersau]

This code for updating the author date after some time wasn't called any more

ungit/components/commit/commit.js

Lines 71 to 82 in 4147fd0

	updateLastAuthorDateFromNow(deltaT) {
	this.lastUpdatedAuthorDateFromNow = this.lastUpdatedAuthorDateFromNow || 0;
	this.lastUpdatedAuthorDateFromNow += deltaT;
	if(this.lastUpdatedAuthorDateFromNow > 60 * 1000) {
	this.lastUpdatedAuthorDateFromNow = 0;
	this.authorDateFromNow(this.authorDate().fromNow());
	}
	}
	updateAnimationFrame(deltaT) {
	this.updateLastAuthorDateFromNow(deltaT);
	}

Because updateAnimationFrame was removed from git-node and graph in #630 which wasn't noted because of this check

ungit/components/repository/repository.js

Line 54 in 4147fd0

if (this.graph.updateAnimationFrame) this.graph.updateAnimationFrame(deltaT);

Since updating the author date is the only thing that is done inside of window.requestAnimationFrame we could also consider changing it to a setTimeout.