treehouses blocker (fixes #657) (fixes #157)

[LordJashin32]

Fixes #657
Fixes #159 possibly

• Uses https://github.com/StevenBlack/hosts
• blocker <0|1|2|3|4|max>
• Blocks websites through editing of the /etc/hosts file
• To test:
  Okay now it works for manual install. Still need to test on new image/npm version. Cheers.
  Run this to test:

git clone http://github.com/treehouses/cli
cd cli;
sudo npm i -g --unsafe-perm ./
sudo treehouses blocker
sudo treehouses blocker 1
sudo treehouses blocker
sudo treehouses blocker 3
sudo vim /etc/hosts

/etc/hosts should be changing whenever a new blocker level is set.

[hiroTochigi]

Do I need to use the latest image to test the branch?
Or, do I need to add something to test the branch?

[LordJashin32]

Do I need to use the latest image to test the branch?
Or, do I need to add something to test the branch?

We'll have to download the image to test it. But for now I have not tested if its working. So gonna put this on hold for now.

[LordJashin32]

Okay now it works for manual install. Still need to test on new image/npm version. Cheers.
Run this to test:

git clone http://github.com/treehouses/cli
cd cli;
sudo npm i -g --unsafe-perm ./
sudo treehouses blocker
sudo treehouses blocker 1
sudo treehouses blocker
sudo treehouses blocker 3
sudo vim /etc/hosts

/etc/hosts should be changing whenever a new blocker level is set.