v2.0.2: Auto merge of #407 - kbknapp:fixrollup, r=kbknapp

v2.0.2 (2016-01-31)

Improvements

• arg_enum: enum declared with arg_enum returns [&'static str; #] instead of Vec (9c4b8a1a)

Bug Fixes

• clap_app! should be gated by unstable, not nightly feature (0c8b84af)
• SubCommands: fixed where subcmds weren't recognized after mult args (c19c17a8, closes #405)
• Usage Parser: fixes a bug where literal single quotes weren't allowed in help strings (0bcc7120, closes #406)