Fix typos in build file
Update build.xml
Merge tag 'v2.3.17' of github.com:symfony/symfony-standard into 2.3

Conflicts:
	README.md
Added composer.json required-dev section with 8 new code quality packages
Reimplemented phploc to use phing task, changed report type from CSV to TXT
Reimplemented phpdoc task to use phpdocumentor2
Updated check:cs task to output full text codesniffer report
Updated check:cs task to output full text codesniffer report
Updated check:md task to also use design and naming rulesets
Updated check:depend task to also generate summary-xml and phpunit-xml reports
Eliminated Docblox tasks because https://twitter.com/docblox/status/195929761409798145
build:clean task no longer is a Main target
Updated path to phpunit to use composed in binary
No longer running composer install from phing, since phing is a dependency of the application and is installed by composer
Removed check task that ran app/console check and replaced it with a main target that ran all quality checks
No longer removing /vendor directory during build:clean because composer owns that directory
Now requiring the build directories before doing quality checks
Created new main task for documentation that wraps phploc and phpdoc sub-tasks
Changed phploc task to generate csv report instead of txt
Reorganized tasks, removed duplicate documentation task