Abstract away time
Wait for element to be present

WebDriver.getElement sometimes throw when running concurrent tests.
Fixup checked exception
[FIXED JENKINS-23035] Update to Selenium 2.41.0
Typo.
Tweak element wait time further
Permit test harness to use http proxy settings

This pull request permits the test harness to use
http proxy settings from both maven settings
and command line arguments.

Artifact Resolution was refactored to be contained
in a single helper class ArtifactResolverUtil.java
Revert "Permit test harness to use http proxy settings"

This reverts commit 59a7c419009024860e29879e18270c27e5078a80.
Fixed installation of newer plugins.