[glance] Switch to FlowRouter

[xavxyz]

After moving subscriptions to template-level (cf. #38), you could switch to kadira:flow-router and use a router only for... routing 💃

Good read: http://guide.meteor.com/routing.html
Good watch which explains the mindset to apply:

• What's up ? https://www.discovermeteor.com/blog/blaze-to-react-01-introduction/
• Subscriptions : https://www.discovermeteor.com/blog/blaze-to-react-02-subscriptions/
• Data Context : https://www.discovermeteor.com/blog/blaze-to-react-03-data-contexts/
• Layouts & Redirects : https://www.discovermeteor.com/blog/blaze-to-react-04-layouts-redirects/
• Template state : https://www.discovermeteor.com/blog/blaze-to-react-05-template-state/
• FlowRouter : https://www.discovermeteor.com/blog/blaze-to-react-06-flowrouter/ 👍