Run travis with speedups enabled and disabled
Pass in speedups option to test from command line

Allows testing speedups by forcing on or off from the command
line as:
python setup.py test --speedups=true
or
python setup.py test --speedups=false

Travis is configured to have an environment variable to run it
both ways
Merge branch 'travis_speedups' of github.com:jwass/Shapely into jwass-travis_speedups

Conflicts:
	shapely/tests/test_speedups.py
Rm speedup specific tests.
Merge branch 'jwass-travis_speedups'