Git fixes

Hello!

I made ​​some changes in the Git settings.

It's unnecessary to create `.gitignore`in each subdirectory, when you can create single `.gitignore` in the root directory with all rules for Git.

You should know, that these subdirectories would not be created on local machine after executing git clone if you remove `.gitignore` files from these subdirectories &mdash; most likely due to the fact that these directories are empty.
But that should not be a issue, because our Gleez Installer capable to create these directories by itself.