Add kind and dep to PATH in Travis

[zubron]

Instead of placing kind and dep in the working directory for
the Travis CI build, place them in a location which is in the
PATH so they can be easily used elsewhere.
It also allows us to fix the deploy_kind target in our Makefile
which assumed that kind was in the current directory.

[codecov-io]

Codecov Report

Merging #902 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #902   +/-   ##
=======================================
  Coverage   46.72%   46.72%           
=======================================
  Files          76       76           
  Lines        5096     5096           
=======================================
  Hits         2381     2381           
  Misses       2577     2577           
  Partials      138      138

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