make sure all keywords of from_array are passed to the __init__

from_array accepted keywords for uncertaity, mask, flags and meta
but did not pass them on the `NDData.__init__`, so that informatmation
was lost. This bug needs to be fixed to make the units tests of #16 pass.
Merge pull request #25 from hamogu/from_arrays

make sure all keywords of from_array are passed to the __init__