categories: changed all colors to ids
custom category color integration, same changes to how the categories model saves values
updated color stuff in expenses add
category and custom color integration
added initial to categories color model
added icon with initials to categories
added category initial to expense add
added category and icon to feeds
custom categories incl intials working everywhere
merge by hand #hipster #yolo
Merge branch 'master' of https://github.com/h10r/kth-expense-tracker