sequelize  bin support options file + migration path

migrationsPath configured via cli

loading all cli switches via json configuration file , loaded via --options
changed options to cli-options due to conflict with commander npm
added tests [sequelize bin support options file + migration path]
Remove length declaration for int and bigint in postgres. Closes #1575
Fix for mysql comment + references. Closes #1521
Move options file to test directory and rename cli-options to options-path
sequelize --options-path path/to/cli/options.js
Dont validate fields that are not saved. Closes #1449
Added .catch to custom event emitter
Add json support to postgres dialect