load IO configuration
Merge pull request #2195 from bendavies/archive-manager-authentication

ArchiveManager IO configuration
Add another svn auth failed string to check (older svn server version)
Merge pull request #2201 from DerManoMann/svn-auth

Add another svn auth failed string to check (older svn server version)
Describe stability flags more consistently
Merge pull request #2203 from johnbenz13/doc-stabflags

Describe stability flags more consistently
Fix build
Update help docs for the global command

I noticed that COMPOSER_HOME/vendor/bin was wrong. Correcting.
Add a note about customizations
Improve global command to support short command resolution
Validate constraints in require command, fixes #2197
Better wording in a note
Merge pull request #2209 from mgrabovsky/patch-1

Better wording in a note
Merge pull request #2205 from unn/patch-1

Update help docs for the global command
Change 'generated' notice to @phpdoc-style annotation

While it isn't an official part of the syntax, it integrates better with other
tools that ignore diffs on generated code.
Fix parse error thrown in PHP5.5+

When running composer update the file generated by AutoloadGenerator was
not able to be parsed by php due to a require statement inside the foreach
loop.

The fix is to make the statement work the same as the
autoload_namespaces.php require is done.

Issue occured using the following php versions

PHP 5.5.1-2+debphp.org~precise+2
PHP 5.5.3-1+debphp.org~precise+2
As preparation for composer plugins, rename custom installers to plugins
Implement a plugin manager and interface, update installer plugin tests
Plugin tests are no longer strictly installer tests
Load installed plugins at appropriate time and adapt tests accordingly