Respect extensions cli option when filtering individual files

[robcmills]

Resolves #561

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[Daniel15]

This could go either way - it's not defined whether passing in an exact filename should bypass the extension filter or not. Changing it so everything observes the extension filter seems reasonable to me though.

[lg-kialo]

This could go either way - it's not defined whether passing in an exact filename should bypass the extension filter or not. Changing it so everything observes the extension filter seems reasonable to me though.

@Daniel15 I disagree, for a single filename supplying the extension twice (once in the filename and once as --extension flag) seems redundant.

[Daniel15]

@lg-kialo The --extension flag is optional. You don't have to provide it.

[lg-kialo]

@Daniel15 you do have to provide it if you want to transform files with extension different than .js.
Before version 0.15.1 jscodeshift -t transform.ts fileToTransform.tsx used to work, now one is forced to use jscodeshift -t transform.ts --extensions=tsx fileToTransform.tsx

[lg-kialo]

My suggestion would be that if no --extensions flag is passed, we don't filter by extension at all. Instead of filtering only files with the default extension (.js) as it is now.