Create setup script

[cannotparse]

Create an install.py that does the following:

• Verifies a config file exists
• Verifies a valid gitolite exists with specified version
  • If invalid, then err out
• Verifies DB connection information is valid
• Looks to see if the schema is present
  • If valid, then offer to erase rows
  • If invalid, create schema
• Validate that the config file has all required parameters, otherwise err