Allow option to avoid loading imfile module twice.

This throws a warning with version 8 of rsyslog.

The best way to use imfile is to define the module list in
extra_modules. However, if you still try to create an imfile without
adding that it will still work the old way (adding modload imfile to the
begining of the imfile).
Fixing merge typos.
Merge pull request #99 from jae2/jed2

Allow option to avoid loading imfile module twice.
module is compatible with puppet enterprise v3.3, fixes #94
new release v3.3.0
fix bug in README