Allow dont_blame_nrpe to be defined in the pillar

The dont_blame_nrpe setting is one that users would typically want to tailor to
their needs and we therefore allow them to do so via pillars.

This should fix #6.
Remove spurious p1_file entry from example pillar

p1_file is not set via pillars, but defined in map.jinja and this entry should
not have made it into the example pillar.
Merge pull request #10 from babilen/issue/empty_p1_file_pillar

Remove spurious p1_file entry from example pillar
Merge pull request #9 from babilen/issue/#6

Allow dont_blame_nrpe to be defined in the pillar
Define configuration file paths explicitly

Configuration file paths were previously derived from concatenating standard
file names with the platform specific nagios configuration directory. This patch
allows for this to be overridden.
Merge pull request #11 from babilen/dev/explicit-conf-files

Define configuration file paths explicitly
Fix wrong paths introduced in last commit
Merge pull request #12 from babilen/bug/correct-paths

Fix wrong paths introduced in last commit
Restructure map.jinja into smaller parts

The dictionary in map.jinja was starting to become a bit unwieldy which is why
this patch restructures it into distinct maps for the various parts.