Fix bash stuff: functions and shebang.
Merge branch 'master' into modules
Rename scripts to include to better match the purpose of the dir
love-release is now modular

I have removed the platform-specific scripts form the main script an I
intend to store them in a specific location where they can be sourced by
the main script.
The mechanism to add a subscript is fairly simple. It is all explained
with comments inside the script.

I also moved out form the main script the getoptex function for
clarification into an include directory that will be use to store an
eventual INI parser later.
Create install.sh
Add plain Love file module