Upgraded flask, werkzeug and Flask-Login packages
Add Flask-DebugToolbar extension

This extension works quite a bit better than injecting get_debug_queries()
ourselves and gives even more information than that.
config/testing: Make sure redirects are not intercepted
lib/decorators: Cast self.msg to unicode before flashing

Usually lazy i18n strings are used in self.msg and the JSON module now
complains that those are not serializable.
config: Make DEBUG_TB_INTERCEPT_REDIRECTS = False the default
scripts/copy_flight_py: add script to copy igc files by some criteria
scripts/delete_flight_by: add script to delete flights by some criteria
import_srtm: Use preprocessed TIF files from the download server
Merge pull request #103 from Turbo87/srtm

import_srtm: Use preprocessed TIF files from the download server
Merge pull request #94 from Turbo87/debug-toolbar

Add Flask-DebugToolbar extension
Merge branch 'master' into flask-upgrade
test_authentication: Fixed login state tests
Merge pull request #99 from Turbo87/flask-upgrade

Upgraded flask, werkzeug and Flask-Login packages
scripts: Create destination directory if it doesn't exist yet
scripts: Use parser.error() method where appropriate
Merge pull request #104 from Turbo87/scripts

Helper Scripts
scripts/analyse: Fixed config import
Airspace: update NL airspace

#2741
Updated skylines.xcsoar.org to www.skylines-project.org
Merge pull request #106 from Turbo87/urls

Updated skylines.xcsoar.org to www.skylines-project.org