A module should always begin with a test to `execute_module` to see if
it should be executed. As modules are always sourced
(even when embedded), a simple `return` will stop the subscript.
Modules are executed in a subscript, so the global space will not be
polluted, and will also be reset after the execution of the module.
This commit also solves some bugs in Makefile and lua parser.
What's new:
- --config flag to pass a INI config file to parse. See config.ini.
- Updated the modules scripts for configuration. Now needs to unset
variables passed by CLI or config.
- Fix release directory that was added in love file (maybe).
- Properly escapes sed arguments.
- chmod +x to getopt.sh and read_ini.sh
- Fix#12
