bundler is not a dependency, so let's not require it
Shouldn't be requiring rubygems, either

rubygems is not a dependency of wraith so it shouldn't be requiring it
http://tomayko.com/writings/require-rubygems-antipattern
Update travis build config to properly set load path

The 'lib' directory is added to the LOAD_PATH by rubygems under normal
usage. but since the gem isn't installed as a gem by travis, the
LOAD_PATH isn't set. So we need to set it manually for the test run.
Merge pull request #106 from jasonkarns/master

wraith should not be requiring bundler