ENH: Support for JupyterLab 2 (quantopian#301)

* JupyterLab 2 compatebility

- Update the python package coupling to the JupyterLab extension to be
less strict, allowing for a coupling to `^1.1.2` instead of exactly
`^1.1.1`. This is very relevant if we make a small bump to the extension
but don't want to make a new release of qgrid, or if qgrid would be
installed by conda and it's availability was delayed so the newer npm
package was available but the python package was outdated and coupled to
the old versions specifically.
- Move various loaders that are only used by webpack to build the json
files from being dependencies to being devDependencies.
- Bump versions of various dependencies to avoid security issues found
in packages by npm.

* Use labextension link instead of install for local dev

A good rule of thumb according to this @vidartf.

ref: https://discourse.jupyter.org/t/about-jupyter-labextension-link-v-s-install/2201/2?u=consideratio

BLD/BUG: GH actions (quantopian#293)

* BLD: GH actions for tests

* BUG: Fix series comparison

* BUG: Fix tz old vs new conversion issues

* BLD: Automatic builds and publish

* BLD: Bump the version

Merge pull request quantopian#275 from quantopian/update-dependencies

Update qgrid for jupyterlab

Merge pull request quantopian#211 from quantopian/edit-cell-docs

Add doc string for the edit_cell method

Merge pull request quantopian#210 from quantopian/fix-bold-index

Add 'toggle_editable' method, and fix the 'boldIndex' grid option

Merge pull request quantopian#203 from quantopian/object-display

1.0.6 beta 6

Merge pull request quantopian#199 from quantopian/fix-edit-unnamed-index

Fixing issue with editing a table with unnamed index columns, bumping version again

Merge pull request quantopian#197 from quantopian/pandas-backward-compat

Make filters for categorical columns work on old versions of pandas, bump to 1.0.4

Merge pull request quantopian#196 from quantopian/bump-version

Bump version to 1.0.3 (promote beta release to GA)

Merge pull request quantopian#194 from quantopian/events-api

Events API