Markdown-toclify

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- fixed bug that headers are stripped from the output if there was
no space between "" and the first letter as in "header".

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- added --exlude_h argument to exclude specified header levels from the table of contents.
- added --placeholder argument to insert the table of contents at a particular
position in the document.
- added --no_toc_header argument to suppress the table of contents header
- added markdown_toclify wrapper function and added markdown_toclify.
as module to PyPI.

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- changes to comply with the new markdown standard 09/03/2014 (http://jgm.github.io/stmd/spec.htm)

1) More than six characters is not a header
2) Space is required between the characters and the header’s contents
3) Headers can be indented by at most 3 spaces:

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- handling special GitHub case "&", which is now substituted by a "--"

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- code refactoring
- removes old back-to-top links

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- smart re-indentation: Table of contents will be shifted one tab to the left if no level-1 heading can be found