Updated man page.
Removed strip commands from make-windows-installer.bat.
Regenerated man page.
deb/Makefile: Renamed COMMIT -> TREE
Fixed windows stack.yaml.
reveal.js template: Fixed parallaxBackground options. `parallaxBackgroundHorizontal` and `parallaxBackgroundVertical` need integer values, not strings. (Vaughn Iverson)
Adjusted trypandoc makefile for use of sandbox.
Version bump to 1.15.1.1, updated changelog.
Fixed typo in make_osx_package.sh.