Initial source code import

Builder is now a shell extension that does a J checkout. Will implement it
as a build wrapper, to access the workspace before even the SCM checkout
is being done.

Signed-off-by: Alin Dobre <alinmd@gmail.com>
Adding a build wrapper

Trying our luck with a build wrapper, which still doesn't seem to work. Shell
execution will still be done with a custom enviuronment, which cannot be
modified from outside.

Also, upgraded the version for Jenkins.

Signed-off-by: Alin Dobre <alinmd@gmail.com>