Added a configuration file for Travis CI

This configuration script tell travis to install dependent libraries, build program and execute make check command.
Merge pull request #52 from mohammedari/travis-ci

Proposal of automated testing with Travis CI
Changed version to v0.2 in READMEs
Add a travis-ci icon to README files
Merge pull request #54 from Nyoho/travis-ci-icon

Add a travis-ci icon in README.md
Added brief warning about building on Windows
(doc) an improvement of Japanese in CONTRIBUTING.md

Improved Japanese in CONTRIBUTING.md
Merge pull request #58 from Nyoho/doc-improve-japanese

(doc) an improvement of Japanese in CONTRIBUTING.md
Fix issue in Windows where PMXViewer runs faster than 60fps