(doc) fix Japanese in CONTRIBUTING.md

日本語的に微妙におかしい点を修正しました。
Change VMDInfo to use vectors instead of C-style arrays
Remove '___Count' variables from VMDInfo structs (use vector's size() func instead)
Remove 'Vocaloid Motion 0002' string from VMDInfo struct (no need to store in memory
Add VMD file-writing function
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