NEW reset catalog function
NEW reset catalog function

* Implements REST `reset` function taking `reload` as example
* Equivalent to request of REST API docs:
http://docs.geoserver.org/latest/en/user/rest/api/reload.html

afabiani/gsconfig,boundlessgeo/gsconfig,garnertb/gsconfig.py,cristianzamar/gsconfig,Geode/gsconfig,scottp-dpaw/gsconfig