public / sequelize

Refactor 2 x hasMany to belongsToMany

…nd not sql statement content

Update `inflection` dependency to v1.5.3

add dialect checks for upsert support

Upserts in MSSQL are non-trivial to implement, adding the ability
to test for support is a valid stopgap for later implementation

stop sequelize from erroneously adding timezone to raw query dates

Only for rawSelects it seems that Sequelize forcibly adds timezone
information to dates returned from the database. This breaks in
strange and magical ways

…(committed or rolled back), closes #2082