assets/bundles: Use rawgithub.com instead of raw.github.com

Fixes strict mimetype handling in debug mode
views/flight: Import cleanup
Merge pull request #125 from Turbo87/import-cleanup

views/flight: Import cleanup
Merge pull request #124 from Turbo87/mimetype

assets/bundles: Use rawgithub.com instead of raw.github.com
assets: Fixed Twitter Bootstrap URLs
events: Fixed link for "Pilot X started following you" events
Merge pull request #126 from Turbo87/follower-event-fix

events: Fixed link for "Pilot X started following you" events
Fixes initialise_database file mention to match the actual filename
Merge pull request #127 from bbonamin/master

Fixes initialise_database file mention to match the actual filename
views/tracking: Removed debug prints
import_welt2000: Fixed missing application context

Fixed issue #128
Fixes INSTALL.md file commands to match actual file locations
Merge pull request #129 from Turbo87/app-context

import_welt2000: Fixed missing application context
Merge pull request #130 from bbonamin/master

Fixes INSTALL.md file commands to match actual file locations
@reify decorator added (ported from pyramid)
Simple achievement detection
Model for unlocked achievements
Correct achievement data extraction
Do not fail to repr flight if no id was yet assigned
Unlocking achievements on track upload