Created integration tests with Cucumber

Created basic integration tests for the home webpage and the breadcrumbs
with Cucumber and Selenium.
Created a test for the Webindex Comparator

Created a test which selects two countries and 1 indicator and checks if
the comparator returns some graphs.
Tests for the comparator and the breadcrumbs

Created new tests for the comparator and precomparator view, the
breadcrumbs and the navigation.
Closes #142
Closes #137
Merge branch 'bugfix-#142' into hotfix-4
Merge branch 'bugfix-#137' into hotfix-4
Merge branch 'hotfix-4' into unit-testing
Created test of the Webindex navigation

The steps have ben refactored
Refactor of the cucumber steps

Some generic util functions have ben moved to an independent Object.
Closes #147
Merge branch 'enhancement-#147' into hotfix-4
Merge branch 'hotfix-4' into develop
Merge branch 'hotfix-4' of https://github.com/weso/wfLodPortal into unit-testing
All utilities extracted to SeleniumUtils
Organized the imports
Merge branch 'unit-testing' into hotfix-4
Merge branch 'hotfix-4' into develop