Update deprecated attributes in sample config

* Changed normal_check_interval to check_interval
* Changed retry_check_interval to retry_interval

According to the documentation the old attribute names should
no longer exist, so switching to the newer documented behavior.

It should not change the behavior of a running environment, but it
can cause a lot of confusion when there is a mix of check_interval
and normal_check_interval in the same configuration object.
travis.yml - add sudo in front of apt-get
travis.yml - remove make install
travis.yml updated
Merge branch 'fix-deprecated-attributes'
Merge branch 'feature-add-travis'
.travis.yml file added into the project

This will make accepting pull requests much nicer, because github
will build naemon on commit and build results will be visible when
pull requests are made.
Merge branch 'feature-travis'

Conflicts:
	.travis.yml
Merge travis