Fix grayed-out Preferences menu in Sublime Text 3

The caption for the preferences menu item needs to be capitalized. When it isn't capitalized the Preferences menu item under Sublime Text on Mac OSX becomes empty and grayed out, and a new top-level item named "preferences" appears in the menu bar.
Remove spurious ending newline.
Merge pull request #8 from dgileadi/patch-1

Fix grayed-out Preferences menu in Sublime Text 3