Allow plugins to have jenkins home and user set

This is a simple fix that just allows us to set the username and home dir for the plugins.
add path => to execs in job subclasses
fix hash rocket indenting to make puppet-lint shut up
Merge pull request #218 from nrvale0/jobs_execs_with_path

add path => to execs in job subclasses
Merge pull request #216 from choffee/patch-1

Allow plugins to have jenkins home and user set