[TASK] preparations for version 1.0.0

[NeoBlack]

• [x] set requirement in composer.json for plugin-installer-plugin to final release not "dev-master"
• [x] remove all code which is marked as deprecated for 1.0.0 #78
• [x] change plugin structure
• [x] update all core plugins, to match the new plugin structure and add a composer.json file
• [x] write down informations for developer how to create a plugin (namespace, vendor, composer) https://github.com/PhileCMS/Phile/wiki/%5BDEVELOPER%5D-Plugins
• [x] make the phpDoc API available under http://philecms.com/api ?

[james2doyle]

Is this good now after the #78 merge?

[NeoBlack]

a documentation for plugins: https://github.com/PhileCMS/Phile/wiki/%5BDEVELOPER%5D-Plugins

all plugins updated to match the new plugin structure