Split requirements files

Remove unused import

src/requirements/dev.txt

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+django-debug-toolbar>=1.3.0

src/requirements/production.txt

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+# Functional requirements
+Django==1.8b2
+pytz
+django-bootstrap3
+-e git+https://github.com/pretix/django-formset-js.git@master#egg=django-formset-js
+-e git+https://github.com/pretix/cleanerversion.git@pretix#egg=cleanerversion
+django-compressor
+
+# Deployment / static file compilation requirements
+BeautifulSoup4
+html5lib
+slimit
+lxml

src/requirements/py33.txt

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+# Polyfill for Python <3.4
+# Remove this, when Python 3.3 support is dropped
+flufl.enum

src/requirements/testing.txt

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+# Testing requirements
+pyflakes
+pep8==1.5.7  # exact requirement by flake8 2.4.0
+pep8-naming
+flake8
+coveralls
+coverage
+selenium
+# PyVirtualDisplay
+# -e git+https://github.com/pretix/sauceclient.git@master#egg=sauceclient
+# travis