Bugfix: Biome environment names can have spaces in them!

Previous to this release, Biomefile environment names couldn't have spaces in them. Now, they can! Give it a try!

$ biome init
Name of Project? my cool project
Enter a variable name you'd like to add, or [Enter] to finish. FOO
Enter foo's default value, or leave empty for none. bar

Ok, let's set up your local environment.
Value for FOO? (bar) baz
The environment my cool project has been created. To start this environment, run biome use.

$ biome use # (or biome use "my cool project")
(my cool project) $

v0.7.0

A few notable changes:

• biome use prepends the current environment to the interactive $PS1 #17
• A new logo! #10
• Fix install 1-liner in readme to make more sense. #25
• Bug: When biome use was passed a custom env to source, it wouldn't source it. #26
• Change phrasing of biome init to explain the difference between it and just biome.