Bump happstack-server to 7.3.9
Add map-syntax
Bump heist to 0.14.0.1. Keep old version happstack-heist-7.2.4 requires heist 0.13. Note from heist 0.14 docs: initHeist In the past you could add templates to your HeistState after initialization using its Monoid instance. Due to implementation details, this is no longer possible. All of your templates must be known when you call this function. -> happstack-heist-7.2.4 is broken by that change.
Bump snap to 0.13.3.1