Update jenkins.py
Update jenkins.py

I found a bug in the build_job function, self[jobname].invoke(params=params) should have "build_params" instead of "params" ,i.e. self[jobname].invoke(build_params=params)

Not sure where else this function is being used through out the api library,but the issue could be in other places.

Hope that helps,
S.A.
jduan/jenkinsapi,imsardine/jenkinsapi,JohnLZeller/jenkinsapi,zaro0508/jenkinsapi,domenkozar/jenkinsapi,imsardine/jenkinsapi,zaro0508/jenkinsapi,mistermocha/jenkinsapi,mistermocha/jenkinsapi,aerickson/jenkinsapi,aerickson/jenkinsapi,zaro0508/jenkinsapi,salimfadhley/jenkinsapi,jduan/jenkinsapi,imsardine/jenkinsapi,salimfadhley/jenkinsapi,domenkozar/jenkinsapi,JohnLZeller/jenkinsapi,mistermocha/jenkinsapi,JohnLZeller/jenkinsapi