Adding Dot Product Plan Operation
HYRISE as a Web Server

This commits adds basic functionality to query the HYRISE server via a simple web interface.
This is achieved by adding a static request handler that will simply return static files
from the file system. To build the correct mime type for the response it uses the mime type
list from the Apache Server project and parses this at startup time. The static FS path
can be set via the environment variable HYRISE_STATIC_PATH or defaults to the current
working directory + static, e.g. something like `cwd`/static

As a first consumer this commit adds the web query interface that allows to run queries
directly from the browser using JavaScript. The result will then be rendered as a classical
table.