implementation of before/after processors
use gopm as get & build tool
elimited BeforeXXX and AfterXXX operations with After() and Before()
add processors tests
code tidy up for processors tests
Merge pull request #27 from nashtsai/processors

implementation of before/after processors
add created & updated tests
add transactional tests for processors
Merge pull request #28 from nashtsai/processors

add transactional tests for processors
merge
fixed query tx bug