avoid unnecessary loading of path
Do not assume process, so the module can be loaded into plv8
load only SqlString from mysql instead of the whole mysql package
Merge remote-tracking branch 'upstream/master' into patch-1

Conflicts:
	lib/sequelize.js
	lib/utils.js
Include SqlString from mysql and do not depend on the mysql package.
fix incorrect merge in 9d40250
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