Add network throttling and device user agent configs

[bmcminn]

Fix #5

EDIT:

• 🐚 add CLI option -A (user agent) with argument validation
• 🐚 add CLI option -Y (network throttling) with argument validation
• fix user-agent string override when using -A
• 🐚 add CLI option --landscape which forces device orientation to landscape
• configure src/profiles/devices.js based on Chromium device profile definitions:
  • https://chromium.googlesource.com/chromium/src/+/master/third_party/WebKit/Source/devtools/front_end/emulated_devices/module.json
• configured src/profiles/networks.js based on Chromium network speed definitions:
  • https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit/Source/devtools/front_end/components/NetworkConditionsSelector.js&q=%22Good%203G%22&sq=package:chromium&dr=C&l=50
• 🎨 general formatting of scripts
• 📋 add commentary to script components

[shyiko]

Good work! Would you mind removing console.log calls and rebase the branch (right now I can't merge it in due to "This branch has conflicts that must be resolved")?

Also, where does src/profiles/devices.js & src/profiles/networks.js data come from? Thank you.

[bmcminn]

Alright, finally got the rebase worked out.

Also, the src/profiles data was extrapolated from the latest Chrome throttling and UA device configs in dev tools.

[shyiko]

I propose we take list of devices from here. What do you think?

[shyiko]

Also, download/upload throttling is calculated differently. See here.

[bmcminn]

I like that idea. Just added those defs verbatim to src/profiles/devices.js.

I also went ahead and fixed up a few other things and updated the PR description. I think this feature is ready to close now.

[shyiko]

Hey man. Unfortunately it looks like this PR will have to wait. My laptop won't turn on :) Will get back to it as soon as I have it fixed.

[bmcminn]

Hey @shyiko any update on your laptop situation?

[shyiko]

@bmcminn I'm getting it back tomorrow morning.