Merge tag 'v1.5.4'

1.5.4
JSDoc improvements

Improve createModel doc, Fix some other minor issues.
Use connector's buildWhere to implement count
Normalize/validate the query filter object
Fix JS doc for private methods
Fix the logical operator check
Merge pull request #130 from strongloop/feature/fix-sql-count

Fix Model.count base implementation and Normalize/validate the query filter
Bump version
Merge branch 'release/1.5.5' into production