added feature_indent variables in some parsers
added feature_indent variables in some parsers

corburn/scikit-bio,gregcaporaso/scikit-bio,jdrudolph/scikit-bio,anderspitman/scikit-bio,jairideout/scikit-bio,kdmurray91/scikit-bio,anderspitman/scikit-bio,jdrudolph/scikit-bio,corburn/scikit-bio,kdmurray91/scikit-bio,gregcaporaso/scikit-bio,jairideout/scikit-bio