Convert indentation to 2-spaces
Major clarity changes to the build file

Newlines, spaces between arguments, and made a couple variable names more
explicit.
Rename 'checkSyntax' to 'checkScriptSyntax'
Add isDir function
Add constants for the output file
Add constant for the container class (Folder)
Create sections and objects to group functions
Move standalone functions to a "helpers" section
Use colon notation for rbxm methods
Set a constant for the source directory
Move checkScriptSyntax and createValue to 'rbxm' object
Contain command-line arguments in a variable
Move version check to the top
Add missed whitespace between arguments