Multi-Distros support + various fixes

• Fix libcurl error on Gitkraken v3+
• Fix the desktop file
• Support OpenSUSE, Mageia, CentOS

Improved script

• Colored output
• Can install the package right away
• Minor fixes

First release!

• New script, similar to the one for XMind
• Downloads and installs gitkraken + installs a .desktop file with an icon