Revert "cabal-freeze dependencies (closes #23)"

This reverts commit 5fa165bab0f173b2714cb025d6a2e043fba3f510.
Remove redundant files
Add DevelMain support
Listen on port specified by PORT env var
Run mueval with timeout specified by MUEVAL_TIMEOUT env var
Load jQuery over HTTPS if needed
Warn user if cookies or local storage is disabled

Issue #25

Warnings are sticked between the header and console. By default they
are hidden. JS codes checks local storage and cookies support and
shows the warnings accordingly.