namespace Limaki.WebServer renamed to Limaki.WebServers
Limaki.WebServers: some cleanup and enhancements
PdfJsServer: internal webserver which serves pdf.js (http://mozilla.github.io/pdf.js/)
introduced PdfContentViewer (shows pdf based on PdfJsServer and HtmlContentViever)
cleanups
Limaki.Common: some enhancements on memorystream-handling