If users want to be able to browse through the history available in
PuppetDB without crashing the server/client with too much information
adding attributes 'order_by', 'limit' and 'offset' to the following
functions:

nodes
facts
resources
reports
events
event_counts

Travis CI Build on this pull request filed due to trailing white-space
and under-indentation of newly modified code.

Details are https://travis-ci.org/puppet-community/pypuppetdb/builds/38442716

Travis CI build is still failing dur to under-indentation at the
lines where the event_counts function is declared.

Details are https://travis-ci.org/puppet-community/pypuppetdb/builds/38443403

Including the order_by, limit and offset parameters to the function
fact_names. Documentation and tests show that it does support
the standard pagination functions

For the function calls and definitions where the parameter list is too
long and need to be appended to new lines, having each parameter in its
own line.

This standardizes the coding style and is compliant to python coding
best practices