[Events Calendar] Ajax-events support
[Events Calendar] Formatting
Datalist polyfill: Fixed polyfill so only displays value if value and label are identical and also corrected undefined checks (fixes #2823 and supercedes #2831).
Merge pull request #2835 from pjackson28/datalistfix

Datalist polyfill: Fixed polyfill so only displays value if value and label are identical and also corrected undefined checks (fixes #2823 and supercedes #2831)
Corrected left mouse button detection for pre-IE9 (fixes #2836).
Merge pull request #2841 from pjackson28/leftmousebuttonfix

Corrected left mouse button detection for pre-IE9 (fixes #2836)
Resolved merge conflict
Fixed rendering of empty footer sections in mobile about popupmenu (fixes #2767 and #2809).
Merge pull request #2844 from pjackson28/footeraboutfix

Fixed rendering of empty footer sections in mobile about popup menu (fixes #2767 and #2809)
Autocomplete (Datalist polyfill): Fix highlighted text colour in Internet Explorer 8 and 9.
Merge pull request #2850 from pjackson28/fixieautocompletecolor

Autocomplete (Datalist polyfill): Fixed highlighted text colour in Internet Explorer 8 and 9
Merge branch 'v3.0'
Merge pull request #2825 from berubs/issue2285

[Events Calendar] Adds ajax-events support
[Date picker] Support IDs containing dot(s)

Ex: <input type="date" id="start.date" />
Merge pull request #2854 from berubs/v3.0

[Date picker] Support IDs containing dot(s)
Merge branch 'v3.0'
Forms: Add input-placeholder mixin

Backported from Compass vNext (0.13), but modified for the 0.12
definition of legacy Firefox.

Fixes gh-2855
Merge pull request #2865 from nschonni/add-placeholder-mixin

Forms: Add input-placeholder mixin
Merge branch 'v3.0'
GC Web Usability Intranet theme: Added missing image (fixes #2859).