Description:

Takes all files from the db/nandi directory and turns
them into ActiveRecordmigration files.

Examples:

rails generate nandi:compile
    compiles all migrations that have changed since last git commit

rails generate nandi:compile --files all
    compiles all migrations ever

rails generate nandi:compile --files 20190101010101
    compiles specific migration

rails generate nandi:compile --files 20190101
    compiles all migrations from January 1st 2019

rails generate nandi:compile --files >=20190101
    compiles all migrations from January 1st 2019 and after