Guarantee that we get the latest code for submodules

[BDHernand]

Description

To consolidate logic between travis files and Makefiles to get the latest code for master branch

Motivation and Context

Updates to makefile were to guarantee that we get the latest master code when we do a make locally. The changes to to the .travis.yml file were to simplify the before_script section.

How Has This Been Tested?

Ran the code through Travis CI which builds Kitura on linux and mac. Also ran a build locally

Checklist:

• [ ] I have submitted a CLA form
• [ ] If applicable, I have updated the documentation accordingly.
• [ ] If applicable, I have added tests to cover my changes.