v0.2: new option, custom foldmarker, better indent

- g:NeatFoldTextUnostrusiveComments:
  hide the comment and just display '/* … */' to show that a comment
  is folded

- now compatible with user's custom foldmarkers

- there is a indent() function, better than manually counting spaces
  and tabs...
rm tags
ignore tags, *.swp
Merge branch 'dev'