fix OWrites implicitNotFound message
Removed X-CONTENT-SECURITY-POLICY header
Switch to twirl template compiler
Ensure generated secret is stable in dev mode
Remove repeated "the"
Merge pull request #2689 from wsargent/patch-5

Remove repeated "the"
Merge pull request #2684 from pvlugter/twirl

Switch to twirl template compiler
Merge pull request #2674 from mkurz/removed_x-content-security-policy

Removed "X-"Content-Security-Policy header - it's a mess
Merge pull request #2594 from xuwei-k/OWrites-implicitNotFound

fix OWrites implicitNotFound message
Merge pull request #2685 from jroper/stable-dev-secret

Ensure generated secret is stable in dev mode
Issue #2668 fixed typo and issue #2690 minor rewrite of BuildingFromSource page.