Merge pull request #43 from gnugat/tech/text

Introduction of Text #40
[1.0.0-alpha6] Updated CHANGELOG
[Services] Removed ContentConverter interface
[Services] Renamed PhpContentConverter to TextToPhpConverter
[Services] Moved TextToPhpConverter into Service
[Service] Moved FileFactory into Service
[Service] Moved TextFactory into Service
[Service] Moved Filesystem into Service
[Service] Moved EditorBuilder into Service
[Service] Removed api tag from services
[Service] Updated EditorBuilder with extensible only services