Predoc is a lightweight document format. We will also develop WYSIWIG mode for Emacs and other related tools.
Added folnlow a-link feature and some bug fixes.
1. Added costomize variable `predoc-curl-program'
2. Added predoc-open-alink() function ( and bind to '[return]' key )
3. Supported "xxx.html anchor-keyword" string convert into `a' tag.
4. Fixed some bugs.
