Implemented basic filtered twitter crawl task. Closes #2.

	modified:   .crawler-settings.dist
	modified:   .gitignore
	modified:   .pydevproject
	modified:   bin/crawler.py
	modified:   src/python/eu/stratosphere/crawl/__init__.py
	new file:   src/python/eu/stratosphere/crawl/twitter/__init__.py
	new file:   src/python/eu/stratosphere/crawl/twitter/auth.py
	new file:   src/python/eu/stratosphere/crawl/twitter/stream.py
	new file:   src/python/eu/stratosphere/crawl/twitter/task.py
	deleted:    src/python/eu/stratosphere/crawl/twittercrawl.py
	modified:   src/python/eu/stratosphere/frontend.py
	deleted:    vendor/deps.txt
Factored out common logic between twitter stream tasks.

	modified:   src/python/eu/stratosphere/crawl/twitter/stream.py
	modified:   src/python/eu/stratosphere/crawl/twitter/task.py
	modified:   src/python/eu/stratosphere/frontend.py