Be more specific about the required package dependancies for Kitura

[kilnerm]

While testing the update Kitura CLI I provisioned a Linux box and followed the instructions from Swift.org for installing Swift which included the install of dependencies as follows: sudo apt-get install clang libicu-dev.

When I then referred to the getting started pages on Kitura.io I skipped the section "Install Swift for Linux" as I had already done it, however when I tried to initialize my Kitura application I ran into missing dependency errors.

When I look at the "Install Swift for Linux" section of the doc it requires the following dependencies: sudo apt-get install clang libicu-dev libcurl4-openssl-dev libssl-dev libpython2.7.

We need to do something to close this potential gap for users who already have Swift installed and working on their Linux environment.