New formula: sqlmap 0.9.

This is meant to supersede https://github.com/Homebrew/homebrew/pull/23679.

**Please note: this is not ready to be merged!** The only tested database drivers are those for PostgreSQL and SQLite. The drivers for MySQL (I've put two of them because v0.9 and the current HEAD seem to use different ones)  are not found by sqlmap: PyMySQL is installed in libexec/lib/python2.7/site-packages/PyMySQL-0.6.1-py2.7.egg/pymysql, whereas sqlmap expects it one level up. The same issue may affect other modules (e.g., NTLM). I don't eat many Python eggs, so I need some help to fix that.