TLS was not being verified in a number of places:

- connections to grafana.com

- connections to OAuth providers when TLS client authentication was
  enabled

- connections to self-hosted Grafana installations when using the CLI
  tool

TLS should always be verified unless the user explicitly enables an
option to skip verification.

Removes some instances where `InsecureSkipVerify` is explicitly set to
`false`, the default, to help avoid confusion and make it more difficult
to regress on this fix by accident.

Adds a `--insecure` flag to `grafana-cli` to skip TLS verification.

Adds a `tls_skip_verify_insecure` setting for OAuth.

Adds a `app_tls_skip_verify_insecure` setting under a new `[plugins]`
section.

I'm not super happy with the way the global setting is used by
`pkg/api/app_routes.go` but that seems to be the existing pattern used.

adding support for token-based slack file.upload API call for posting images to slack

* colorpicker: initial picker with predefined palette and spectrum

* colorpicker: highlight selected color

* colorpicker: add onChange() callback

* colorpicker: replace singlestat picker by new one

* colorpicker: style tweak

* colorpicker: parse color on input blur

* colorpicker: sort palette by hue and lightness

* colorpicker: refactor, move colors sorting to 'app/core/utils/colors'

* tech: colorpicker - fix linter errors

* colorpicker: convert to React components

* colorpicker: fix spectrum import after moving to webpack

* colorpicker: minor refactor

* colorpicker: initial series color picker

* colorpicker: fix tests error

* styling changes and some text changes

* styling changes

* fixing checkboxes

* deleted old file, fixed checkboxes

* minor change

redesigned dashboard links settingd, fixed a misspelling in rows and added fixed width to buttons (#9397)

Merge branch 'update-alert-lists' of https://github.com/Ijin08/grafana into Ijin08-update-alert-lists

* webpack poc, this is not going to work for plugins, dam

* tech: webpack and systemjs for plugins starting to work

* tech: webpack and systemjs combo starting to work

* tech: webpack + karma tests progress

* tech: webpack + karma progress

* tech: working on tests

* tech: webpack

* tech: webpack + karma, all tests pass

* tech: webpack + karma, all tests pass

* tech: webpack all tests pass

* webpack: getting closer

* tech: webpack progress

* webpack: further build refinements

* webpack: ng annotate fixes

* webpack: optimized build fix

* tech: minor fix for elasticsearch

* tech: webpack + ace editor

* tech: restored lodash move mixin compatability

* tech: added enzyme react test and upgraded to react v16

* tech: package version fix

* tech: added testdata to built in bundle

* webpack: sass progress

* tech: prod & dev build is working for the sass

* tech: clean up unused grunt stuff and moved to scripts folder

* tech: added vendor and manifest chunks, updated readme and docs

* tech: webpack finishing touches