default off for markdown_enable_insert_mode_mappings
Merge pull request #8 from wilmoore/markdown_enable_insert_mode_mappings-default-off

default off for markdown_enable_insert_mode_mappings
Removed support for autolink HTML anchors

Not really supported by any markdown flavour, nor GFM, nor Kramdown,
nor the original, I guess I initially supported that because it was easy
:-)
Switch header level with <Space>
Removed fold configuration in files