steal.import() also loads "main" script

[stucox]

In a Node env, loading Steal & importing a script also imports the main script ("main" property in package.json if defined, otherwise attempts to load ./index.js)

// start.js
const steal = require('steal');
steal.import('src/app');

$ node start.js
Potentially unhandled rejection [4] Error: Error loading "index" at file:/Users/stuartcox/code/tmp/index.js
ENOENT: no such file or directory, open '<cwd>/index.js'
    at Error (native)

On #800 @matthewp said this should be considered a bug: presumably steal.import('src/app') should just load ./src/app.js (and its dependencies).

[matthewp]

Closed by #885