feat(runner): use selenium and chromedriver from the default location if nothing else is specified
fix(element): element.all.get and element.all.first/last should wrap web elements

Closes #307
fix(runner): merge should override entire arrays, not just parts of them

Closes #304
chore(release): update versions and changelog for 0.14.0
Merge remote-tracking branch 'vrtdev/master' into HEAD