Add ignore file pattern for MAc OS X
Move "twitterinfo.h" into project directory

before:
- "twitterinfo.h" was in "../KanmusuMemoryTwitter/" directory

after:
- "twitterinfo.h" is in this project root directory
- add "twitterinfo.h" to .gitignore
Support build on Travis-CI(Ubuntu)

reference:
- https://github.com/travis-ci/travis-ci/issues/1317