Allow select null values from timestamp or integer types
Merge pull request #30 from eyeem/master

Testing and a number of fixes
Merge pull request #33 from netkuup/master

Allow select null values from timestamp or integer types
fix readInt() for negative values

use strrev() then unpack('l') instead of unpack('N'), which is for unsigned int
Merge pull request #34 from locked/master

fix readInt() for negative values
fix negative int in collections