Fixed #2 (not working after Yosemite)

## Fixes #2 

Issues: 

1. 
>Yosemite doesn't have Ruby 1.8 by default, and that was causing an Ascii encoding issue with the plist parse.rb file

2. 
>The script filter hardcoded the 1.8 ruby path 

Fixes:

1. 
>Set the default encoding of boom.rb to UTF-8 (http://www.alfredforum.com/topic/3173-ruby-workflows-in-mavericks/?p=19605) based on this post and removes the non-working shebang calls. 

2. 
>Replace the current 1.8 ruby call: 
```
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby ./boom.rb filter {query}
```
>with a call to the system ruby

```
/usr/bin/ruby
```
>This should work for both 1.8 and 2.0 installations of ruby. 
This part is already in the file later, I think that maybe you failed some copypasta code.