don't force a build
fix bug where it looked for a build "attempt+1" times
Revert "don't force a build"

This reverts commit 6ee282e9d50ad59aabffdcfd3866fab170358631.

Conflicts:

	lib/util/jenkins.js
made forcing the build configurable
Merge pull request #32 from mynnx/do_not_force_a_build

Make forcing the build configurable for Jenkins