move testcases to doc
change ext of readme to .asc - looks better on github
add ftdetect by Stuart Rackham

Assumes all txt, README, TODO, CHANGELOG and NOTES files are asciidoc
add readme to doc and convert to vim-help format
add options to control when asciidoc ft will be set
fix txt options and improve guessing

Change regex used for matching - use the one in the syntax file. Also
fix function not being run for txt files.
fix guess and force options for common file names
add documentation for options
Merge remote-tracking branch 'mrotaru/master'

Conflicts:
	ftdetect/asciidoc_filetype.vim

==asciidoc_filetype.vim
  a. incorporated options for filetype detection
  b. switched to set filetype vs setfiletype (latter d/n override )
==asciidocTestSyntaxPatterns-Clean.adoc
  a. new file with asciidoc examples, test cases, vim syntax hilights