deleted depreciated modules and move other modules or files
moved files in examples and added notebooks (temp)
updated examples (temp)
Added data proxy + diaginfo and tracerinfo metadata. Fixed 2D fields (now 2D arrays).
added ipython notebook checkpoints to gitignore
fixed possible empty units in bpch datablocks metadata
iris support of bpch is now operational
Added GEOSFP to supported grid models + pep8 stuff
moved grid specifications to a new module utils.gridspec
pep8 stuff
docstring changes + refactoring
re-organized examples scripts and notebooks
moved module timeutil from utils to tools + re-written coord_from_grid in irisutil (no allows a region bounding box)
updated examples with ND49
fixed wrong file handling when trying to recognize the bpch format
added Iris load callbacks (fixes) for netCDF files created with GAMAP
remove cube attributes imported from GAMAP's COARDS netCDF files (temp)
changed the names of cubes imported from bpch files to be consistent with those defined in GAMAP's netCDF files
allow to override more easily the properties of Record subclasses
now a RecordList object can accept items of multiple specified classes