run remix-lib tests on v0.5.4+commit.9549d8ff

fix: handle bignumber conversion on hash without prefix

ethereum/populus is no longer maintained. Use ours.

Updated regex in Memory Debugger to exclude replacing space with '?'

Fix test

fix: storageRangeAt doesn't always take a callback

Allow timestamps to be passed to rawRun

This is useful when, for example, running a recorded .json
file for cases that rely on a specific time between transactions.

If no timestamp is passed as part of the tx argument to
runRaw, behavior does not change.

Add module declaration

Update README.md

improve userdoc for sender account

Fix tests

Update package.json

Fix remix-url-resolver package.json

add bins & command line params for simulator and debugger

Update release-process.md

fix remix-url-resolver package.json