Renaming size util classes
JPEGs compressed with lossy compression
All JPEGs compressed either with 90% (some logos & screenshots) or 80% (photos and remaining logos/screenshots) quality compression
ImageOptim GUI tool was used - uses the JPEGOptim, JpegTran and JpegRescan libraries.
Commit saving 0.7Mb on the PNGs, and have made them progressive (I believe)
Hero images resized to 1920px wide, and compressed to 80% compression.
Merge pull request #276 from gocardless/jpeg-compress-with-imageoptim

JPEGs compressed with lossy compression
Merge pull request #275 from gocardless/size-util

Renaming size util classes
Adding background fallback for page hero & fixing extra closing li tag
Merge pull request #279 from gocardless/page-hero-background-color

Adding background colour fallback for page-hero
Merge branch 'dev'