Improve/fix 0install bug

user bin folder not created by 0install when installing

Its a bug in 0install. Waiting for next release. In the mean time, update command for installation to include creation of ~/bin directory
https://github.com/0install/0install/commit/3902366c0203d29a96aca279831b2a532b509b0f

hosting of zanata-cli feed in http://zanata.org/files/0install/zanata-cli.xml causing redirect loop during installation.

Moved the reference of feed file to github raw.