BF: loadFromXML checks 'componentsFolders' option.
Merge pull request #247 from hsogo/master

BF: loadFromXML ignores 'componentsFolders' option.
Merge pull request #249 from jeremygray/master

left-right mirror for TextStim and BufferImageStim
BF: RatingScale wrapWidth for scale description

thanks to Giuseppe Pagnoni for the fix.
(also decreased some code indentation to better fit in 80 char columns)