Remove capybara and selenium-webdriver from installed RMs
Remove capybara and selenium-webdriver from installed RMs

This commit changes the install script to strip capybara and
selenium-webdriver from Redmines Gemfile as we need more recent versions
for testing. It adds them as new dependencies to Redmines Gemfile
instead of declaring them locally to avoid issues conflicts when
installing the plugin on non-modified Redmines.

jgraichen/redmine_dashboard,jgraichen/redmine_dashboard,jgraichen/redmine_dashboard