Moved module.

Moved 'nodevers.helper.tcolor' to
'nodevers.tcolor'.
Added a new function.

Added a new function ('getshell()') in
'nodevers.misc' that returns the name
of the currently used shell.
Added new imports.

'nodevers.helper(.__init__)' now imports
also 'nodevers.misc' and 'nodevers.exceptions'.
Added getshell() to __all__.
Added empty module.