Added LogEntries handler and tests.

Added handler for http://logentries.com.  It uses their token-based input to send the log messages.

Let me know what you think and if there are any improvements I can make.  I'm currently debating making a custom formatter for this but as you can see below the LineFormatter works quite well.

![2014-03-28-230909_748x268_scrot](https://cloud.githubusercontent.com/assets/1910307/2557086/94aeb42c-b6ef-11e3-860f-b4acd990c6d5.png)