Add reset!() method.
Remove settune!() method.
Move code for tune() method.
Fix sigma overwrites and updates.
Call reset!() from setinits!().
Require the tune dictionary field in Sampler type to be {String,Any}.
Update documentation version to 0.3.2.
Note pmap-related fix.
Replace deepcopy() with copy() where appropriate.
Implement "sampler" tuning parameter to standardize with other Samplers.
Update references.
Update headers.