[geany/geany] cdb748: Add filetype extraction by regex

[Lex Trotman]

  Branch: refs/heads/master
  Home:   https://github.com/geany/geany

  Commit: cdb748c2c48f4e845e8354a58d75db5ec6e73487
      https://github.com/geany/geany/commit/cdb748c2c48f4e845e8354a58d75db5ec6e73487
  Author: Lex Trotman <elextr at gmail.com>
  Date:   2011-10-22 (Sat, 22 Oct 2011)

  Changed paths:
    M doc/geany.html
  M doc/geany.txt
  M src/document.h
  M src/filetypes.c
  M src/keyfile.c

  Log Message:
  -----------
  Add filetype extraction by regex

Adds the ability to set filetype on open by extracting it from the
file using a regex on the first few lines (default 2).