Minor comment
Adding tutorial and documentation

Adding documentation and edit users_guide to edit what
few components do (Ecohydrologic components only)
Adding figures for radiation field tutorial

adding figures (outputs) for radiation field tutorial
Used sphinx API doc force

used API DOC force to update sphinx files
deleting unwanted files_ test

testing removal of unwanted files
removed some RST files and updating tutorial

removed some unwanted RST files and updated radiation_field tutorial
RST reference in index.rst

updated index.rst to point to the right radiation tutorial
minor updates to rst

minor updates to radiation tutorial
Minor formatting tweak for docs
typo
Merge pull request #1 from landlab/master

merging