Install libgdal1h from ubuntugis ppa on Travis CI
TST: Lock geopy version ==0.99
TST: Disable pandas master tests for python 2.6 and 3.2
Revert "TST: Disable pandas master tests..."

This reverts commit 95d2e20fe59af0ace72c3ab2faef1e0157a4735e.
BUG/TST: Fix tests - don't do math on Index

Treat Index objects as set-like. Convert to Series before doing
arithmetic. This broke when Pandas Index no longer subclassed from
NDArray.
Merge pull request #157 from jwass/fix_travis

Fix tests