Renamed wrapper.bash to credulous.sh
Why did I ignore credulous.spec?
Install credulous.sh to /etc/profile.d

We want the wrapper to be loaded without any work from user.
The wrapper creates a bash function that sources output of
the 'credulous source' command into the current environment.
gitignore travis_build_number

We're using is locally because travis can't build both OSX/Linux
for same project.
Update debian packaging to include credulous.sh in /etc/profile.d