Merge branch 'master' into develop

Release 5.1.1 (Kong#268)

* Skip invalid cookies and some tweaks

* Fix adding context menu multiple times (Kong#254)

* Update electron and fix React key warning

* OAuth password field should abide by password setting (Kong#256)

* Size app icon appropriately

* Better errors inside environment editors (Kong#257)

* Start a fresh OAuth2 session every launch (Kong#258)

* Show folder name in response tag dialog (Kong#259)

* Some autocomplete tweaks and added ctrl+Enter shortcut

* npm@5 in CI and package-lock.json

* Always have equals signs in x-www-form-urlencoded bodies (Kong#265)

* Bump version

Fix menu bar hiding

Bump version

Added import from URI ability (Kong#160)

* Added import from URI ability

* Add protocol handlers

* Fix for keymap setting on read-only mode

* Refactored some main components out

* Protocols shoudl work now

More flexible content type changing

Added code editor indent settings (Kong#147)

* Added code editor indent settings (Kong#145)

* Added default indent size (4) in code editor (Kong#145)

Fix some minor bugs (Kong#139)

* Keyboard shortcut for hotkeys

* Fixed some small bugs

Fixed content-length on uploads (Kong#135)

More 5.0 Fixes and Stuff (Kong#134)

* Fix OAuth token, new request content-type, and more

* better error messaging around invalid Curl opts

* Make XFERINFOFUNCTION an optional option

* Fix content-type change prompt and double quotes in prettify

* Don't send Expect header on file upload

* Remove dead code

* Base64 tag

* Fix HTML entities in URL clicks

* Fix curl paste