[MRG] Remove all 0.16 deprecated parameters / classes

remove deprecated ``n_bootstraps`` parameter in Bootstrap cv object, ver...bose in FactorAnalysis and SelectorMixin. Also adjust some deprecation strings.

This takes care of all deprecations for 0.16.
I also checked that all mentions of ``DeprecationWarning`` and ``@deprecated`` are properly tagged with either 0.17 or 0.18.