First commit by Pierre. Added the h5mol.rst file with the first thougts for a atomistic simulations file format specification.
h5mol: wrap at 80 chars per line and append underscore to references.
Generate sphinx config.
h5mol: convert from latin1 to utf8.

h5mol.rst:33: WARNING: undecodable source characters, replacing with "?": 'All arrays are stored in C-order as enforced by the HDF5 file format (see `>>>\xa7<<<'
Add _build to .gitignore.
Add h5mol to index.
Remove Documentation from title(s).
Fixed typo (missing parenthesis).
Added the 'in discussion' section.
Added some elements: force, force field, species mass, box size, time step.
Changed h5mol in h5md for "hdf5 for molecular data".
Modified the index.rst file to reflect the change of h5mol in h5md.
Modification to the general informations.
Switch to sphinxdoc theme.

sphinxdoc theme has lighter colours and smaller font size.
Added a section on reserved names and placed r,v and f into it.
Started a "in discussion" element about the reserved names.
Decided on the naming scheme to be "full names" ('position' instead of 'r', for instance).
Added macroscopic observables information.
Added reference to optional units. Specified the species dataset.
Added the link to "step" and "time" as attributes to the trajectory datasets.
Added a paragraph on the "step" and "time" datasets/groups to keep
the time information of the trajectory datasets.
Added global attributes creator, h5md_version and datetime. Updated the reserved names accordingly.