Updates to testsystems to fix how nonbondedMethod is specified for most tests.
Fixed typos.
Updates to testsystems.
Updated travis build dependencies.
Updated conda build.
Updated verbosity of testing.
Disabled parallel tempering tests since we only need testsystems to work right now.
Merge pull request #134 from jchodera/update-testsystems

Updates to testsystems to fix how nonbondedMethod is specified