Initial Commit ... WIP
* Test.fs: initial test for paragraph conversion passes

* Component1.fs:
Walk method now handling the different node types
* Test.fs: Unit test for em span element

* Component1.fs: support to convert em
* Script.fsx:
* Test.fs:
* Component1.fs:
* packages.config:
* MarkdownText.fs:
* ASTTest.fs:
* MarkdownNode.fs:
* DOMTest.fs:
* MarkdownBlock.fs:
* HtmlToMarkdown.fs:
* MarkdownParagraph.fs:
* MarkdownContainer.fs:
* ConversionTest.fs:
* MarkdownForWhat.fsproj:
* MarkdownForWhat.Test.fsproj: 

* HtmlToMarkdownParser.fs: created a parser to generate a DOM for the
  markdown content
* MarkdownText.fs, MarkdownNode.fs, DOMTest.fs, MarkdownBlock.fs,
  MarkdownParagraph.fs, MarkdownContainer.fs, MarkdownNode.fs,
  MarkdownForWhat.fsproj, MarkdownBlock.fs, HtmlToMarkdownParser.fs,
  MarkdownParagraph.fs, MarkdownContainer.fs: 

* MarkdownForWhat.sln: Moved DOM classes into the Model folder.
Most common use-cases will be to convert html to markdown or markdown
  to html (eventually), so the user should never have to open the
  Model namespace in the common cases, so no need to muddy the base
  namespace with these classes.
additional file
* DOMTest.fs, MarkdownContainer.fs: 

* HtmlToMarkdownParser.fs: Changed parser implementation to use
  mutually recursive functions that can be expanded for future
  implementations.
* MarkdownForWhat.fsproj: 

* packages.config: Updated htmlagilitypack to latest version
* ConversionTest.fs: Rewrote the unit tests to pass in
  pre-constructed test models to the renderer

* HtmlToMarkdown.fs: Changed implementation to render markdown based
  on the pre-parsed markdown model, which is now handled by the parser
  (ie. html -> markdown model)

* MarkdownForWhat.fsproj, HtmlToMarkdownParser.fs:
* DOMTest.fs: Added new unit test for two paragraph parsing

* MarkdownForWhat.sln:
Parser now supports strong

* MarkdownSpan.fs, MarkdownStrong.fs: 

* DOMTest.fs: test for strong node parsing

* HtmlToMarkdownParser.fs: element handling for strong

* MarkdownForWhat.fsproj: added span and strong
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