slimerjs: install via npm package
spawn: pass phantomas options via args (not stdin)
Show SlimerJS version and path
Improve handling of --debug option
Provide modules path when running using SlimerJS
Improve detection of phantomas home directory
ipc: use stdout

Don't emit plain text to stdout, use IPC events instead
timeToFirstByte: emit "responseEdit" internally
slimerjs: exit with a proper code
windowPerformance: use native window.performance (if available)
progress: check if supported
Modules: fail early on require('fast-stats')
IPC: long JSON-encoded messages were received in batches
globalVariables: filter out 0, 1, 2, ...
Fix failing unit tests
Abstract engines selection
Abstract engines definition
SlimerJS: onInitialized is called twice
onLoadStarted: trigger just once
requestsMonitor: bodySize for SlimerJS + offenders for "gzipRequests"