vitalizer: show only related modules' changes
fix parse error when multiple modules exist in 'Modules: ...' line
if 'Modules: ...' line is not specified, show the change always
vitalizer: s:has_common_items() was moved to Data.List (thanks @thinca)
able to specify modules separated by spaces (thanks @thinca)
omg, Vim regexp pattern '.' matches also newline character!?
Data.List: add help for has_common_items()
Data.List: add spec for has_common_items()
Merge pull request #97 from vim-jp/show-only-related-changes

vitalizer: show only related modules' changes