Can hit EACCES on Linux due to bad HOME env variable on clean install

[isc-tleavitt]

e.g.:
glob error [Error: EACCES: permission denied, scandir '/root/.npm/_logs'] {
errno: -13,
code: 'EACCES',
syscall: 'scandir',
path: '/root/.npm/_logs'
}
npm WARN logfile Error: EACCES: permission denied, scandir '/root/.npm/_logs'
npm WARN logfile error cleaning log files [Error: EACCES: permission denied, scandir '/root/.npm/_logs'] {
npm WARN logfile errno: -13,
npm WARN logfile code: 'EACCES',
npm WARN logfile syscall: 'scandir',
npm WARN logfile path: '/root/.npm/_logs'
npm WARN logfile }

It's possible to work around this by setting the HOME environment variable properly but this might not be quite right - need to find a way around this.