remove unnecessary runtime dependencies
remove Gemfile.lock

http://yehudakatz.com/2010/12/16/clarifying-the-roles-of-the-gemspec-and-gemfile/
Merge pull request #4 from shime/patch-1

remove unnecessary runtime dependencies
Merge pull request #5 from shime/remove-gemfile-lock

remove Gemfile.lock
Build version 0.1.4
Merge pull request #6 from shime/master

some improvements
Add code block to README
Update README.md
extract messages into a module