Adding detection for process.env.MARKO_HOT_RELOAD with assumeUpToDate configuration variable. If files are hot reloaded, we should never assume that they are up to date.
Adding detection for process.env.MARKO_HOT_RELOAD with assumeUpToDate configuration variable. If files are hot reloaded, we should never assume that they are up to date.

Fixes issue #319

marko-js/marko,marko-js/marko