BLD: pip wheel support is stable, travis can use the provided version

Author: y-p

ci/install.sh

@@ -28,12 +28,6 @@ function edit_init()
 
 edit_init
 
-# Install Dependencies
-# as of pip 1.4rc2, wheel files are still being broken regularly, this is a
-# known good commit. should revert to pypi when a final release is out
-pip_commit=42102e9deaea99db08b681d06906c2945f6f95e2
-pip install -I git+https://github.com/pypa/pip@$pip_commit#egg=pip
-
 python_major_version="${TRAVIS_PYTHON_VERSION:0:1}"
 [ "$python_major_version" == "2" ] && python_major_version=""