WIP: Create script to merge develop into master

**Still in progress, see #99. Do not merge!**

Creating script that would merge develop into master and prepare it to releasement would be great enhacement and time-saver for developer who releases new versions.

If it is possible, his script would do:

1. `git pull https://github.com/phpBB-Social-Network/phpBB-Social-Network.git develop` ✔
2. `git checkout master` ✔
3. `git merge develop` ✔
4. remove everything but install_instructions/, root/, .gitignore, README.md ✔
5. rewrite README.md to fit version on master ✔
6. copy install_mod.xml from install_instructions/ to / ✔
7. minify JS files in `/root/socialnet/js/`
8. `git push https://github.com/phpBB-Social-Network/phpBB-Social-Network.git master`