Update liferay-docs with fixexd markdown converter

Hi Jesse,

I'd like you to review these changes. Looking at the changes in this branch will help in briefing you on the Markdown converter.

Here are the main changes:

- Added all versioned JARs (Markdown converter snapshot JAR, pegdown, parboiled, and asm)
- Removed the code/markdown-converter project from liferay-docs. This way we rely soley on the JARs. (I'll show you how to setup a test environment on Eclipse for testing against the module). Moved the Markdown main file into liferay-doc-utils.
- Added a main program that demonstrates testing and debugging Pegdown nodes.
- Lastly, I added a new fixed JAR in place of the snapshot JAR, until a snapshot JAR is ready. The sidebar instability is fixed in this JAR.

Thanks for reviewing. I'll send you more info and setup a time with you to go over the parser. 

Jim