Update 00-intro.md
Add test case for removing unused dependencies on whitelisted update
Add test to verify that depency packages get deleted when no longer in lock file
Fix formatting
Add suppor for https_proxy, fixes #3204
Fix typo in test
Add SNI settings for SSL URLs that are proxied, fixes #3204
Fix failures
Skip tests on hhvm
should fix composer/composer#3382
Merge pull request #3544 from alcohol/match-event-to-listener-expectation

fix for composer/composer#3382
fixes composer/composer#3546
Merge pull request #3547 from alcohol/fix-reflection

fix reflection implementation in EventDispatcher
Enhancement: Add sort-packages option which allows sorting of packages
Merge pull request #3549 from localheinz/feature/sort-dependencies

Enhancement: Add sort-packages option which allows sorting of packages
add --prefer-lowest-stable to update command
split update --prefer-lowest and --prefer-stable
Fix HHVM interop
Point users at troubleshooting if they get known exceptions
Merge remote-tracking branch 'PaulSchell/patch-1'