Merge pull request #31 from starschema/node-connector

Added build task to gulp.
update submodule ref: gtest
datasrc minor interface changes
update makefile w/ datasrc files
data src lib is feature complete for the data types we actually use
fix missing functionality
fix PB conversion issues
add unit tests for the datasrc lib
fix column disposal by using rvalue reference; fix multiple column disposal
Merge pull request #32 from dbeck/master

add unit tests for the datasrc lib
fix fundamental issues in datasrc and memory issue
remove unneeded log
aync_worker's exception is treated harder
update submodule ref
update submodule ref
be a better citizen w/ memory management
add utf8 sanitizer; column pool is now bounded to limit memory consumption
Merge pull request #33 from dbeck/master

add utf8 sanitizer; column pool is now bounded to limit memory consumption
exception forwarding from the async worker of connector clients
Merge pull request #34 from dbeck/master

exception forwarding from the async worker of connector clients