flight.js: Replaced g.raphael by flot and data table
flights.js: Added contest markers again
flight.js: Allow single flights to be highlighted in the barogram
tracking: Add with_trailing_slash decorator
Merge remote-tracking branches 'xtophe/master' and 'snip/master'
Added sublime text project file
controllers: Fixed format
setup.py: Simplified dependencies
INSTALL: Updated instructions
tracking: Replaced rank() by row_number()

rank() can potentially result in duplicates
import_welt2000: fix ul field import
import_airspaces: allow local airspace files
Add major goals of the Skylines project in the about-Section
about: Fixed indentation
about: Make external links open in new window/tab

.. and add link to Welt2000 project
Merge branch 'tbl'
tracking: Extracted get_latest_fixes() method
tracking: Added max_age parameter to get_latest_fixes() method
tracking: Extracted complex query components
tracking: Added basic latest.json API