Move Travis to supported Linux distribution - use Ubuntu 14.04 (Trusty)   - Travis support for Trusty is in Beta and currently requires `sudo` - run `dnu restore` with DNX Core since aspnet/External#49 is not fixed in Mono versions we can use - add required dependencies for DNX Core to `.travis.yml` - addresses part of aspnet/Universe#290
Move Travis to supported Linux distribution
- use Ubuntu 14.04 (Trusty)
  - Travis support for Trusty is in Beta and currently requires `sudo`
- run `dnu restore` with DNX Core since aspnet/External#49 is not fixed in Mono versions we can use
- add required dependencies for DNX Core to `.travis.yml`
- addresses part of aspnet/Universe#290

OmniSharp/omnisharp-scaffolding,OmniSharp/omnisharp-scaffolding