Improve project (add composer, add .gitignore, rm predis from git cache, fix short_tags)

[seyfer]

1. fix short tags to full php tags. it's important for runing this app on modern environment
2. rm Predis from cache and add it like composer requirements. it's important for always install latest Predis version
3. add .gitingore to handle vendor/ dir
4. add autoloading by composer , fix some code style..

[cassiosantos]

:+1: