bug fix @file mode
  - multiple file read bug fix 
  - read readme (read 'README.md'from current command-line path)
  - output page default charset to 'utf-8'

ex) 
  _makedoc ./src/module.js ./src/module2.js
     : select specified 2 files
  _makedoc ./src
     : select all file in ./src if ./src is directory
  _makedoc ./src/*.js 
     : select all .js files in src
  _makedoc src  or _makedoc src/*.js
     : same with ./src or ./src/*.js