Return color of removed module to TimetableModuleCollection. Fixes #39
Use themes JSON to populate theme selection in Preferences
Extract faculties out into a JSON file
Extract theme-related code into a separate directory
Update GA with new tracking code
Optimize images with ImageOptim - 32.4% savings
Change contact email to mods@nusmods.com
Revert "Update GA with new tracking code"

This reverts commit 36d5f8db82c048d8f51ce68d8939bf35e7fa774b.
Changed default faculty to FASS
Merge branch 'master' into production