If I set to bytestoint, Float values are not converted to Int, that was I changed it in 299cc8ba59bb8302f9e50c5ea9875d55b175bcba

Example with bytestoint:
```
julia> readtable("TEST",coltypes=[Float64],header=false)
6x1 DataFrame:
             x1
[1,]        6.3
[2,]       4.05
[3,]        6.6
[4,]       31.2
[5,]    100.234
[6,]        9.7


julia> readtable("TEST",coltypes=[Int64],header=false)
6x1 DataFrame:
         x1
[1,]      3
[2,]      5
[3,]    600
[4,]     20
[5,]    234
[6,]      7
 ```