Removing travis-ci from the cowboy development toolkit

We've been having many recurring issues, some which were fixed,
only to have other things broken again. Can't rely on a service
that breaks all the time.

.travis.yml

@@ -1,7 +0,0 @@
-language: erlang
-otp_release:
-  - R15B
-  - R14B04
-  - R14B03
-  - R14B02
-script: "make tests"