Use short filenames to handle spaces in path to bin\mix
Merge pull request #2508 from chyndman/mix-bat-short-names

Use short filenames to handle spaces in path to bin\mix
Mention app: false on no app error
Add performance note to String.slice/1
Require Record before in defrecord samples
Use sigil syntax in Macro.to_string
Merge pull request #2511 from ericmj/macro-tostring-sigils

Use sigil syntax in Macro.to_string