added descriptive alternative label for nested grid rows
recoded title area for new header layout #120
restyled title area for new header design #120
recoded search and navigation for new layout, #120
restyled navigation and search area layout #120
changed primary colour variable to green'
colour and typography changes to header, for #120
refactored header search changes to only apply to header searches
recoded and restyled search box
added refactored search to homepage
tweaked shared search box styles to make reuse easier
added refactored search box to speaker header
tweaked width of refactored search box
made  a default value, now overridable
fixed spacing in header
removed unneeded class from search box
links now use  sass variable, rather than foundations
added icon sprite for search button
resolved merge conflict