abs-lang / abs / 367

Pull #189

travis-ci-com

number.round(decimals), number.floor(), number.ceil()

closes #183, closes #184, closes #185

```
10.9.floor() # 10
"a".floor() # ERROR: floor(...) can only be called on strings which represent numbers, 'a' given
"10.9".floor() # 10
10.3.ceil() # 11
"a".ceil() # ERROR: ceil(...) can only be called on strings which represent numbers, 'a' given
"10.3".ceil() # 11
10.3.round() # 10
10.6.round() # 11
10.333.round(1) # 10.3
"10.333".round(1) # 10.3
"a".round() # ERROR: round(...) can only be called on strings which represent numbers, 'a' given
```

60 of 60 new or added lines in 1 file covered. (100.0%)

4788 of 6514 relevant lines covered (73.5%)

62.18 hits per line