Fixes Cryptocurrency Demo

[eminn]

Fix the custom processor which cause CCE. Fixes #55
After the fix, output can be seen as below.

/------+---------------+---------------+----------------\
|      |          Sentiment (tweet count)               |
| Coin | Last 30 sec   | Last minute   | Last 5 minutes |
|------+---------------+---------------+----------------|
| BTC  | -0.0588 ( 26) | -0.0539 ( 38) | -0.0539 ( 38)  |
| XEM  | -0.0541 (  6) | -0.0541 (  6) | -0.0541 (  6)  |
| XRP  | -0.0513 (  2) | -0.0513 (  2) | -0.0513 (  2)  |
| ETH  | -0.0736 ( 30) | -0.0518 ( 46) | -0.0518 ( 46)  |
| XLM  |  0.0224 (  1) |  0.0224 (  1) |  0.0224 (  1)  |
| EOS  | -0.0412 (  3) | -0.0655 (  5) | -0.0655 (  5)  |
| LTC  | -0.0570 (  5) | -0.0475 (  6) | -0.0475 (  6)  |
\------+---------------+---------------+----------------/