[TIMOB-3384] apidoc: Change markdown dependency to markdown2

Hmm, we need support for fenced code blocks (the "three tilde" code blocks we do all over the place in "titanium markdown"). Python-Markdown (import markdown) supports this via a built-in extension which we use. python-markdown2 (import markdown2) has no such support and I really don't want to write it. :)

For now, to get rid of the external markdown dependency in docgen.py (so we don't need to easy_install it on build machines), I'm packing in markdown, since it's BSD License. Yup, that means we have two markdown processors packaged in our source tree. :) Maybe Marshall is not married to markdown2?

(from [cf9148d2287e8ef92bf0944984370664aa7a16df]) Remove scons package.py markdown module warning, since it's no longer relevant. [#3384] https://github.com/appcelerator/titanium_mobile/commit/cf9148d2287e8ef92bf0944984370664aa7a16df"> https://github.com/appcelerator/titanium_mobile/commit/cf9148d2287e...

Main commit:
https://github.com/appcelerator/titanium_mobile/commit/a223ce421f4931c9a1e109237483983df5178d1b"> https://github.com/appcelerator/titanium_mobile/commit/a223ce421f49...

For thorough QE testing:

• Make sure you can build the SDK without any warnings on both OS X and Windows.

• When you unzip the built SDK, make sure the file api.jsca is in the root, and is not 0-length file (it's about 3.9MB).

• Make sure (on Windows and OS X) that you can go to the apidoc/ source folder and successfully run python docgen.py. (By successfully I mean it completes without error.

BTW, when you test this, note that you do need the python Mako and Pygments modules to do that third step (the python docgen.py step). I wanted to mention that, in case you've never run python docgen.py before.