added timeseries tests fix for IE

Fix footer tests

Fix footer tests: Change locators

Deleted welcomescreen action
Merge branch 'master' of https://github.com/alterm4nn/ChronoZoom
Update chromewebdriver

Fix marker_mouse test

Ignore welcomescreen test

Fix exhibit_should_allow_pdf_content_item_adding test
Merge branch 'master' of https://github.com/alterm4nn/ChronoZoom
Merge pull request #797 from a-chumagin/master

UI: Fix timeseries and footer tests