record where the screenshot is captured for cross-referencing output

git-svn-id: https://svn.apache.org/repos/asf/continuum/branches/CONTINUUM-2713@1547305 13f79535-47bb-0310-9956-ffa450edef68
allow re-running tests

git-svn-id: https://svn.apache.org/repos/asf/continuum/branches/CONTINUUM-2713@1547306 13f79535-47bb-0310-9956-ffa450edef68
abstract out some settings so we can point to a development instance

git-svn-id: https://svn.apache.org/repos/asf/continuum/branches/CONTINUUM-2713@1547307 13f79535-47bb-0310-9956-ffa450edef68
remove redundant assertions

git-svn-id: https://svn.apache.org/repos/asf/continuum/branches/CONTINUUM-2713@1547308 13f79535-47bb-0310-9956-ffa450edef68