Merge pull request #2599 from LaurentGoderre/v3.0

Added the post build environment variable and the v4.0 to the supported branches
Fixed the post build condition
Updated build version to v3.0.8-release.
Updated README.md and Home pages with new release information.
Fixed the post build script syntax
Changed build version to v3.0.9-development.
Merge branch 'v3.0' of https://github.com/wet-boew/wet-boew into v3.0
Fixed another syntax error in the post build script
Split up version history into v3.0 and v3.1 and added links to the changelogs.
Menu bar: Added space between menu link and sub-menu help.
Merge pull request #2601 from pjackson28/v3.0

Menu bar: Added space between menu link and sub-menu help
Simplified the travis.yml
Fixed broken links to ARB terms and conditions wiki pages.
Merge pull request #2624 from EricDunsworth/v3.0-broken-link-fixes

Fixed broken links to ARB terms and conditions wiki pages.
Set pseudo-focused button background colours to !important in Grids SCSS. Prevents button-styled summaries from losing background colours on hover/focus when JS is disabled.
Tabbedinterface: fixed check for hidden child tab panels
Merge pull request #2655 from EricDunsworth/v3.0-grids-button-summary-bg

Set pseudo-focused button background colours to !important in Grids SCSS...
Merge pull request #2656 from patheard/nested-tabs

Tabbedinterface: fixed check for hidden child tab panels
i18n: grammar fix to session timeout message
Merge pull request #2658 from patheard/session-timeout-text

i18n: grammar fix to session timeout message