* OAuth 2.0 Classes Added

Added oauthlib in requirement.txt
Added class WebApplicationServer for Authorization code grant and Bearer tokens.
Added class OAuthWebRequestValidator for Validating Oauth Request for Web Application

* copied code from mnt_oauth needs review

* [New] OAuth2 Doctypes and endpoints added

Integrations > OAuth Provider Settings
Integration Broker > OAuth Bearer Token
Integration Broker > OAuth Authorization Code
Integration Broker > OAuth Client
endpoints for authorize, approve, get_token, revoke_token and test_resource

* oauth2.py: renamed skipauth to skip_auth

* [Fix] Parse URL instead of storing it in settings

* [Fix] get skip_auth from OAuth Provider Settings

* Success URL format. Failure URL added. Confirmation dialog layout changed.

* Validate access token if passed during use of REST API

* OAuth Confirmation colours fixed

* Multiple Changes

Added links for OAuth under Integrations in Module list.
Updated permissions on OAuth doctypes.
Updated layout of OAuth Client doctype.

* [Docs] Integrations > How to setup OAuth

* [Docs] Integration > Using OAuth

* [Fix] get_token endpoint must to handle POST request

* [Fix] http verbs and responses for OAuth 2.0 Endpoints

* [Fix] accept oauth2 access_token from headers

* Removed unused imports from api.py

* [fix] refactor integration services

* [fix] patch fix

* [fix] added redirect url.

* [fix] custom redirect to and reditect message for paypal and service setup information

* [minor][fix] remove ldap dependancy from requirements

* [enhancement] integration borker and controller

* [minor][fix] parameter naming changes

* [fix] common scheduler for integration service

* [fix] integrations

* [patch] patch to move payment gateway in Integration Service

* [fix] add payment success, cancel and failuer handling pages

* [enhancment] dropbox integration merged in integration services

* provision to add custom parameters

* [fixes] patch fix to setup dropbox settings

* [fixes] removed dropbox backup, api usage note for paypal and razorpay

* [minor][fix] deprecate service events

* [fix] return type fix for checkout urls

* [fix] add custom settings via patch for dropbox backup frequency

* [fix] remove gride editting

* [enhance] ldap based login

* [enhance] login via ldap credentails

* [commit] remove parameter table, save params as json dict

I could not see where this was actually needed.

Signed-off-by: Paul Belanger <pabelanger@redhat.com>

- Option during upload + all new incoming email files will be private
- Paired with @rmehta

Executing the 'bench init frappe-bench' command in OSX the latest version of watchdog fails. Using watchdog 0.8.0 it works properly.