Make sure to fetch categories only once
Make sure to fetch categories only once

Test Plan:
Loaded homepage, saw /api/categories only once in network
inspector.

Reviewers: divad12

Reviewed By: divad12

Subscribers: spicyj, divad12

Differential Revision: http://phabricator.benalpert.com/D201

jonafato/vim-awesome,starcraftman/vim-awesome,starcraftman/vim-awesome,jonafato/vim-awesome,starcraftman/vim-awesome,shaialon/vim-awesome,divad12/vim-awesome,vim-awesome/vim-awesome,starcraftman/vim-awesome,shaialon/vim-awesome,jonafato/vim-awesome,shaialon/vim-awesome,jonafato/vim-awesome,divad12/vim-awesome,vim-awesome/vim-awesome,divad12/vim-awesome,vim-awesome/vim-awesome,vim-awesome/vim-awesome,divad12/vim-awesome,vim-awesome/vim-awesome,shaialon/vim-awesome