Removed slick grid and replaced with datagrid
reworked loading sequence
add styling to the loading msg, fix code formatting
add a loading indicator for rendering the notebook too
reindent another block, remove the status messages that do not work because the JS engine is busy anyway, and we already did the important one
Merge remote-tracking branch 'origin/ildipo/datatables' into ildipo/loadsequence
 test
Revert "Merge remote-tracking branch 'origin/ildipo/datatables' into ildipo/loadsequence"

This reverts commit 702abae025687c437057b477372c6e14d9dadbb9, reversing
changes made to d40b3e0543e01e60d6c79111a4b9771e57652c58.
final changes for groovy loading and large notebook loading
Merge pull request #751 from twosigma/ildipo/loadsequence

not to be merged yet