using render_to_string in render_template
using mark_safe for render_html in order to be compatible with django svn 6671
ignoring .pyc for real
delete bike/R/__init__.pyc
doc updates, tutorials
custom backend docs updated
R.Plot.save_data fails silently; pyc files marked ignorable
no pyc minor debugging augmentations
updated bike dataset and docs
PlotErrors raised in R module