Fixed path to travis_install.sh

Currently pyscaffold generates a Travis installation script named `travis_install.sh` yet `.travis.yml` refers to `install.sh`. Consequently Travis builds fail unless the developer manually modifies the path. This minor change results in a Travis setup that works out of the box.
Merge pull request #30 from roskakori/patch-1

Fixed path to travis_install.sh
DOC: Updated changes
Merge branch 'master' into dev

Conflicts:
	CHANGES.rst