rust setup breaking travis CI

[drinckes]

The rust setup added in #71 has broken the travis CI build process:

$ sudo apt-get -y install libstd-rust-1.16 libstd-rust-dev rustc cargo
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package libstd-rust-1.16
E: Couldn't find any package by glob 'libstd-rust-1.16'
E: Couldn't find any package by regex 'libstd-rust-1.16
The command "sudo apt-get -y install libstd-rust-1.16 libstd-rust-dev rustc cargo" failed and exited with 100 during .

[drinckes]

As a temporary fix, I'm going to comment out the rust parts of the travis config.

[drinckes]

I'm going to close the issue! Awesomes!