Added /vendor to .gitignore for users who vendor gems
Check for nil tags on Webtrends::Event#track

* check for nil or empty tags before posting an event to Webtrends
* added nil tags test
* tweaked test description text
* bumped to v0.0.2
Merge pull request #3 from amaabca/check_for_nil_tags

Check for nil tags
Added Webtrends::Exception

If we get an exception when we post using RestClient we will wrap it
up as Webtrends::Exception. This gives consumer apps something reliable
to rescue or handle, and will be remain the same even if we switch out
REST client gems.
Merge pull request #4 from amaabca/webtrends_exception

Added Webtrends::Exception
Merge branch 'master' into add_client_service

Conflicts:
	lib/webtrends.rb
	lib/webtrends/version.rb