GRE-400 Updating default memory to 1GB
GRE-392 Require authentication for post/delete/put if the admin password env variable has been set

= Note this is very hard to unit test as this is implement very close to the scalatra framework
= It has been tested manually though
= Alex may still provide alternate text for the README.txt and basic auth pop-up (realm)
= Otherwise it seems done to me, please review