Add get_step() method such to avoid calling put() with a step paramater.
Add get_step() method such to avoid calling put() with a step paramater.

The get_step() method wills search for a registered parameter called
current_iteration. If it is found, it will be used such as a step value
for an observation (otherwise -1 will be used).

geektoni/shogun,lisitsyn/shogun,karlnapf/shogun,lambday/shogun,lisitsyn/shogun,geektoni/shogun,shogun-toolbox/shogun,karlnapf/shogun,geektoni/shogun,lambday/shogun,besser82/shogun,geektoni/shogun,lisitsyn/shogun,karlnapf/shogun,lisitsyn/shogun,geektoni/shogun,shogun-toolbox/shogun,shogun-toolbox/shogun,karlnapf/shogun,lambday/shogun,shogun-toolbox/shogun,geektoni/shogun,lisitsyn/shogun,karlnapf/shogun,shogun-toolbox/shogun,lambday/shogun,besser82/shogun,lisitsyn/shogun,karlnapf/shogun,besser82/shogun,shogun-toolbox/shogun,lambday/shogun,besser82/shogun,besser82/shogun,lambday/shogun,besser82/shogun