How to get Open File selector to show hidden files?
You can use ⇧⌘. (shift-command-.) to show hidden files in a file dialog temporarily.
To make Sublime Text show hidden files by default, run:
defaults write com.sublimetext.2 AppleShowAllFiles -bool true
To show hidden files in all applications but not in Finder, run:
defaults write -g AppleShowAllFiles -bool true
defaults write com.apple.Finder AppleShowAllFiles -bool false
You can apply the changes by quitting and reopening applications. AppleShowAllFiles also affects other views besides file dialogs.