`NewLocalFS` could read from disk everytime instead of reading on initialization

[vividvilla]

NewLocalFS reads files on initialization and returns the content on Get call but on development workflow if the file changes then it doesn't return the new content. So instead of reading on initialization Get method can read from local file system whenever its called.

[knadh]

Whew, completely lost track of this issue! Perhaps a new NewLiveFS() could be introduced that does this? Please feel free to send a PR if you have time @vividvilla.