Add support for Job Folders (CloudBees Folders Plugin).
fix for #237

When the first job for the job was deleted and there is only one job (latest?)
in the build, get_job() API fail with TypeError.

This commit fixes this issue.
  https://github.com/salimfadhley/jenkinsapi/issues/237
Merge pull request #238 from bhuvaneswaran/stories/237

fix for #237
Fix tests.
logging fix for invalid response
get_build_triggerurl logic fix

job.get_build_triggerurl had invalid logic for determining what build url to be using.  Parameterized builds can only be started via the rest API with the buildWithParameters endpoint even if you don't pass any parameters in.
job.get_build_triggerurl update

job.get_build_triggerurl doesn't need arguments anymore
fixing pylint failure
Merge pull request #239 from rocktavious/login_fix

logging fix for invalid response
Version bump
Remove inactive developers from the main PROJECT_AUTHORS.
Move @lechat up the list since he's the most active maintainer
Adding method to expose /computer/api/python

 - allows one to query totalExecutors and busyExecutors on a master
 - tests included, both unit and sys
removing debug message
Merge pull request #241 from makewhatis/master

Adding a method to expose /computer/api/python
Merge pull request #236 from jvale/job_folders_support

Add support for Job Folders (CloudBees Folders Plugin).
making change more pythonic
Merge pull request #242 from rocktavious/build_invoke_fix

Build invoke fix