Improved docs.cgi code formatting.
Now code set off with <code>...</code> tags will have newlines and whitespace
preserved.
Code that is in its own paragraph gets converted to a div with class codeblock
(currently gives it a gray background).
Added a drop shadow to screenshot elements
testing out text and math
adding more stuff to the measure_mps example, changed Maxm in basic_dmrg to be in code
adding in code and bondTensors
Edited docs/recipes/measure_mps.md via GitHub
Merge pull request #2 from lowagner/master

measure_mps example
Formatted new recipes/measure_mps.md.
Added some more auto code formatting to docs.cgi
Added some more papers to the reading section.
Added a converter for cond-mat references.
Updated code samples on home page to reflect new Model classes, comma initializer.
Updated title of continuum DMRG paper in Papers Using ITensor section.
Updated docs to reflect latest library changes and for readability.
Removed THIS_IS_MAIN from MPS measurement doc page
Added reading and recipes docs pages to version control.
Changed 'Contribute' page to 'Collaboration'.
Added complete sample code to basic dmrg recipes page
Added 'people' directory with photos of collaborators
Added a new subpage to the tutorial, and edited the main tutorial page.
Added figures to the simple_measurement tutorial page
Added a figure to the second code example on the home page