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
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master

Details
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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(-)