Strip duplicate querystrings from the url before adding document.location.search

When a querystring is passed with the url (for example Translatable locale) it is duplicated each time the content panel is reloaded, by adding document.location.search and so it should be stripped from the url first.
Update rssfeed.md

add $allowed_actions
Merge pull request #2544 from cieszak/patch-2

Update rssfeed.md
$i18nScriptDirection template placeholder

Optional RTL support based on Zend_Locale data.
Not set in CMS by default because it breaks the layout
quite badly without deep CSS modifications.
Merge pull request #2532 from chillu/pulls/i18n-dir

$i18nLocaleDirection template placeholder
Fallback for i18n::get_script_direction()
Installer regression from dd49834
Allow non-action buttons to pass through validation (fixes #2527)

The specific example for this issue is InlineFormField - results in actionName() on non-object error. See #2527 for context.

Include parentheses for coding conventions
Merge pull request #2533 from kinglozzer/2527-cmsform-inlineformactions

Allow non-action buttons to pass through validation (fixes #2527)
Running Travis+Behat through Selenium, save artifacts
Regression in travis.yml ($WEBROOT undefined, matrix broken)
Running Behat tests on PHP 5.4 (needs integrated webserver)
suggest that arg_separator.output to be &, if set to something else it may result in issues with url parameters
Merge pull request #2535 from Martimiz/3.1

Strip duplicate querystrings from the url before adding document.location.search
changed install.php5 to respect line length limit according to SilverStripe coding conventions
formatted install.php5 according to SilverStripe coding conventions (tabs instead of spaces, no 1 line if with else, ...)
formatted install.php5 according to SilverStripe coding conventions (spaces)
Merge pull request #2549 from Zauberfisch/3.1

suggest that arg_separator.output to be &
Merge pull request #2550 from Zauberfisch/3.1

formatted install.php5 according to SilverStripe coding conventions
BUG Fixed incorrect CSS class on MoneyField holder