Added support for comments with # (start of line only)

This is a simple change, but it allows users to add a comment in the console by starting a line with "#". This can be nice when providing screenshots of how to do certain things from within the console. While a more robust commenting system would be nice, there very well may be legitimate reasons to include '#' elsewhere in other commands. This at least provides the ability to use basic comments.

![20141010-selection-03](https://cloud.githubusercontent.com/assets/2043879/4598375/20d7b1ee-50b8-11e4-8cea-1a502cf9f429.png)

Note to reviewer: It may make more sense to add a simple return statement near line 376. E.g:
```ruby
return false if method == "#"
```
It seemed safer to add the check at the end (in case anyone wanted to do something weird with the dispatcher). If you disagree, just let me know, and I will make the change.