Update link to jenkins
Create jniLibs directory

This direcotry is required to store jtoxcore libraries (the ".gitignore" file is used to keep the directory alive)
Update README.md

Update AndroidStudio version (0.5.8)
Update SDK Tools version (22.6.3)
Merge branch 'README-fix' of https://github.com/Ansa89/Antox into Ansa89-README-fix
Merge branch 'Ansa89-README-fix'