move GLobalConfigurable back into nbconvert2
restore globalconfigurable
start tinkerign with config system
to clean (transformer deepcopy)
allow to overwrite LaTexTransformer options
comit from home
finish up config merging
pylint plus sphinx default to non-interactive.
Merge pull request #172 from Carreau/deepcopy

Deepcopy

rework of config system to fix non-configurability bugs.
fix non-existing directory
fix overescaped underscores
Merge pull request #179 from Carreau/global-configurable

Restaure Global configurable
Deleted reveal_base from nb1.
Added overflow-y to the slides.
Merge pull request #181 from damianavila/erase_nb1_reveal_template

Deleted reveal_base from nb1.
Merge pull request #182 from damianavila/overflow_y

Added overflow-y to the slides.