webgen.phpc: changed description for 'onedir' parameter
Added support for loading of libraries

Support:
Composer /vendor/ dir (/vendor/autoload.php)
Own loader file: (/libs/autoload.php)
RobotLoader: scanning all files in /libs/

Added new config options:
input.libsDir (libs)
input.composerFile (composer.json)
output.cacheDir (cache)

Info about RobotLoader: http://doc.nette.org/cs/2.0/auto-loading
Examples: added 'external-libs'
Examples: updated