Script "start:dev" fixed

removed optional dependencies from npm-shrinkwrap.json 

postcss script changed

Environments

generated npm-shrinkwrap.json file

added npm script to re-run shrinkwrap and ran it to account for the addtion of deep-freeze in PR #39

Reducer tests

# Conflicts:
#	README.md

Corrected typo for test command

added postcss

Test issue fix