avoid unnecessary loading of path
Do not assume process, so the module can be loaded into plv8
Include SqlString from mysql and do not depend on the mysql package.
delay migrator loading
move mysql into devDependencies so travis can pick it up
bump validator to 0.4.x, as 0.3 requires node-specific net module
warning message when mysql dialect is loaded without mysql module installed
Merge pull request #355 from clkao/patch-1

remove mysql package as dependency (thanks to clkao)