pgAdmin 4 commit: Add support for creating dialogs, and add an About di

Add support for creating dialogs, and add an About dialog.

This adds bootstrap-dialog to help with creation of nice dialogs,
and adds the ability for modules to render Javascript into the
browser, and specify onclick handlers in the menu system.

Also add a basic About dialog, using the new infrastructure and
showing some useful info about the application.

Branch
------
master

Details
-------
http://git.postgresql.org/gitweb?p=pgadmin4.git;a=commitdiff;h=53d649de701ba42e4f910d39037972ebb5754db3

Modified Files
--------------
web/config.py                                      |    3 +
web/pgadmin/about/browser.py                       |   15 +-
web/pgadmin/about/templates/about/browser.js       |   16 +
web/pgadmin/about/templates/about/index.html       |   29 +-
web/pgadmin/about/views.py                         |   18 +-
web/pgadmin/browser/templates/browser/index.html   |   14 +-
web/pgadmin/browser/views.py                       |   11 +-
web/pgadmin/static/css/bootstrap-dialog.css        |  120 ++
web/pgadmin/static/css/bootstrap-dialog.min.css    |    1 +
web/pgadmin/static/img/logo-128.png                |  Bin 0 -> 22429 bytes
web/pgadmin/static/img/logo-right-128.png          |  Bin 0 -> 22418 bytes
web/pgadmin/static/js/vendor/bootstrap-dialog.js   | 1239 ++++++++++++++++++++
.../static/js/vendor/bootstrap-dialog.min.js       |    1 +
web/pgadmin/templates/base.html                    |    2 +
web/pgadmin/templates/security/watermark.html      |    2 +-
15 files changed, 1457 insertions(+), 14 deletions(-)