Unfortunately Finder has no option to show hidden files. But if you open the Terminal and ask your computer nicely – it will display the hidden files. This is how you do it.

Open ~/Applications/Utilities/Terminal and type the following:

defaults write com.apple.finder AppleShowAllFiles -bool true

and press return. Then restart the Finder by either typing

killall Finder

and pressing return, or hold down Ctrl+Option while clicking on Finder icon in the Dock and select Relaunch.

Relaunch OS X Finder

To disable displaying the hidden files, just repeat the process above, only replace the word true with false.