let read_res add structure even in non-resonance case

The method read_res is often called first. If the LRP flag for
the material is -1, there's no resonance data, and the method did not
change anything.
However other methods expects _read_res to set structur[nuc]['data'],
added function to fill it with a single entry for mat_id and empty values
some mods
Merge branch 'develop' of https://github.com/pyne/pyne into website
Starting website changes.
Sidebar works.
Progress.
pep8 stuff
add export control warning and PEP8 fixes
Adding css file.
fix string splits
fix string splits
check if there's a group in q_val
Updated install info.
Merge branch 'develop' of https://github.com/pyne/pyne into cinderwarn
Merge branch 'develop' of https://github.com/pyne/pyne into pepstuff
Progress
Removing old files.
Experimenting with different backgrounds.
add better check for decay table

needed now that pre-built has Q-value data
Merge branch 'crbates-qvalfix' into develop