Introducing the Hercules Standalone Script Syntax Checker

After several months, it should be finally ready to merge.

- Added a command line argument '--script-check' to check a script's
  syntax without running the server (and without requiring a SQL
  connection). Usage: ./map-server --script-check /path/to/the/script.txt
- For convenience, a script-checker bash script is provided, to set the
  path correctly when called from a different directory. Usage:
  /path/to/Hercules/script-checker /path/to/the/script/to/check.txt
- While the script checker will supposedly work under windows as well,
  no convenience scripts are currently provided for platforms other than
  UNIX (feel free to open a pull request with a .bat launcher or
  whatever you like)
- Integration with IDEs or text editors is possible. In fact, I already
  have a fully functional plugin for vim (through vim-syntastic), and if
  there's enough interest, I'll publish it. - screenshot: http://d.pr/i/NOBD
- If you want an online checker, http://haru.ws/scriptchecker/ is
  running this code, without modifications and will be kept up to date
  (without any warranty though.)
- Special thanks to Ind, Yommy, Streusel, who helped making this
  possible, in a way or another.