Include padding on padded edit form panels inside a tabset
Minor: Update "Editing Online"

Adding emphasis to the "Edit this page" feature, and ensuring it comes before the more difficult option of locating the .md file manually.
API: Don't allow dots in URL segments
Merge pull request #1348 from danrye/patch-3

Minor: Update "Editing Online"
Merge pull request #1349 from ajshort/pulls/urlsegment-filter-dots

API: Don't allow dots in URL segments
Merge pull request #1346 from ajshort/pulls/tab-panel-padding

Include padding on padded edit form panels inside a tabset
Updated bugtracker links
Contribution guidelines, new bugtracker links
Merge remote-tracking branch 'origin/3.0' into 3.1

Conflicts:
	.travis.yml
	admin/javascript/LeftAndMain.AddForm.js
	docs/en/reference/requirements.md
Form now loads correctly when ClassName is changed.
API i18n::$common_languages and i18n::$common_locales converted to Config API

They are now accessed via the Config API, and contain associative rather than indexed arrays.
Before: `array('de_DE' => array('German', 'Deutsch'))`, after: `array('de_DE' => array('name' => 'German', 'native' => 'Deutsch'))`.

Also fixed a i18n.js_i18n config accessor