Two more module_exists.
Make sure proper environment is loaded.
Spelling correction in output message
Merge pull request #732 from isntall/master-spelling-correction

Spelling correction in Composer related error message
Fix #731. Error when downloading a project without a release.
Merge pull request #727 from clemens-tolboom/feature/module-exists-part-3

Convert two more module_exists to drush_module_exists.
Minor improvements to user-cancel.
Fix #464 for user-cancel.
Fix #737. Error: no alias record could be found for target @self
Merge branch 'master' into nd