Remove BigBang/monkey-lib dependencies for rbx support. Fix #6

I removed & replaced `sinatra-sugar` & `monkey-lib`. Seems to work great.

But there is an issue with sintra-contib on jruby 19 that seems to be specific to travis-ci. Work for me with `jruby 1.7.0 (1.9.3p203) 2012-10-22 ff1ebbe on Java HotSpot(TM) 64-Bit Server VM 1.6.0_41-b02-445-10M4107 [darwin-x86_64]`. 

```
Installing sinatra (1.3.6) 
Using sinatra-advanced-routes (0.5.2) from source at . 

Psych::SyntaxError: (<unknown>): 'reader' unacceptable character '' (0x82) special characters are not allowed
in "'reader'", position 278 at line 0 column 0
An error occurred while installing sinatra-contrib (1.3.2), and Bundler cannot
continue.
Make sure that `gem install sinatra-contrib -v '1.3.2'` succeeds before
bundling.
```

https://travis-ci.org/hooktstudios/sinatra-advanced-routes/builds/5581650

Ref #6