Fixed a wrong index.
A minimal comment
Merge pull request #14 from sissa/fix_docs

Fixed a wrong index.
Merge pull request #17 from GivAlz/fix_docs

basis_span comments and cell_span
added a comment
Merge pull request #15 from nicola-giuliani/fix_docs

added a comment
Added LagrangeVectorSpace.
Fixed a few things, added matrices.
Merge pull request #23 from luca-heltai/lagrange_vector_space

Added LagrangeVectorSpace.
Merge branch 'master' into optimization_interface