(fix) Install modules where one module name is a substring of the other

[noodle]

Modules don't install or clean up correctly when a !== b but a.indexOf(b) === 0

e.g. when a = 'lodash' and b = 'lod'

ya.add(['lod', 'lodash']);
yield ya.install();

var lod = ya.get('lod'); // correct
var lodash = ya.get('lodash'); // null

[coveralls]

Coverage increased (+0.05%) to 92.419% when pulling 906ef4a on noodle:dev2/v1.0 into 2ff93a3 on jstty:dev/v1.0.