composer/composer

Changed default repository URL from packagist.org to repo.packagist.org, this might affect people with strict firewall rules
Changed output from Updating to Downgrading when performing package downgrades, this might affect anything parsing output
Several minor performance improvements
Added the overridden platform config's PHP version in the diagnose command output
Added basic authentication support for mercurial repos
Added explicit i and u aliases for the install and update commands
Added support for show command to output json format with --tree
Added support for {glob,braces} support in the path repository's path argument
Added support in status command for showing diffs in vendor dir even for packages installed as dist/zip archives
Added --remove-vcs flag to create-project command to avoid prompting for keeping VCS files
Added --no-secure-http flag to create-project command to bypass https (use at your own risk)
Added pre-command-run event that lets plugins modify arguments
Added RemoteFilesystem::getRemoteContents extension point
Fixed setting scripts via config command
Fixed --no-plugins not being respected in a few commands