removed the ravel_peak parameter in peaks_from_model call
fixed temp files issue in peaks_from_model parallel
Merge pull request #264 from gabknight/peak_from_model_tmp_files

peak_from_model tmp files
added optional B, Binv params to peaks_from_model
fixed typos
Merge pull request #265 from gabknight/peak_from_model_issue253

Peak from model issue #253
BF - join pool before trying to delete temp directory
Merge pull request #266 from MrBago/bf_delete_tempdir

BF - join pool before trying to delete temp directory

Fixes gh-265. It seems that Windows was trying to delete the temp directory before all the workers had fully exited.