Clean symlinks

Replaced semver and updated logic to support newer node versioning lo…

…gic. Closes nvm-windows#276

Fixes issue nvm-windows#268.

Version bump to support mirror fixes and rollback support.

Merge branch 'master' of github.com:coreybutler/nvm-windows

Added support for vX.X.X and removed option to open prompt after inst…

…all.

v1.1.0

Version bump

Now using goxc for build process.

Added build script