Initial support highlighting return value type
Improve highlighting for 'make' builtin function

Display actually type as possible
Cask does not work no longer on Emacs 23
Run with Cask for individual tests
Improve displaying return value

Type of return value is wrapped with parenthesis if it has spaces even so
arguments is only one.
Add test for left hand side case
Add missing format argument
Merge pull request #18 from syohex/improve-retval-type

[WIP] Improve retval type