resolve_job_folders skipping jobs fix

JenkinsBase.resolve_job_folders removed jobs from the list while
iterating, causing jobs to be skipped over whenever a job folder was
encountered.
Changed Jenkins URL to download LTS version

Bleeding edge version may not be stable.
add unit test for multiple top level folders
Merge pull request #248 from Toumaz/master

resolve_job_folders skipping jobs fix
polling jenkins each time Jobs is initialized
Add support to create Jenkins object without immediately polling jobs.
Merge pull request #254 from jvale/lazy_load_jobs

Add support to create Jenkins object without immediately polling jobs.
minor fix to exception messages to improve readability.
Merge remote-tracking branch 'upstream/master'
Merge pull request #256 from sateeshkumarb/master

minor fix to exception messages to improve readability.
Adapt fingerprint to catch HTTPError from requests

Remove reference to urllib2 exceptions as the HTTP fetches
uses 'requests' module
Merge pull request #257 from sateeshkumarb/master

Adapt fingerprint to catch HTTPError from requests
Add a few Jenkins API usage examples

Add following examples showing usage of Jenkins API:
* Get Jenkins version, Get Job details, Enable/disable a job
Fixed pylint violations
Merge pull request #261 from lechat/master

Fixed pylint violations
Simplified get_job_url function
Merge pull request #262 from lechat/master

Simplified view.get_job_url function
Merge pull request #260 from sateeshkumarb/patch-1

Add a few Jenkins API usage examples
Merge pull request #252 from jpiron/develop

polling jenkins each time Jobs is initialized
Add support to create Jenkins object without immediately polling jobs.