Migrate to Express 4

• Feature Logical OR checkbox in listview filter
• Feature add pre list view event #58
• Features static select options as objects #60
• Feature Support multiple schemas for pg. Define schema per table to override the default one. #48
• Migrate bootstrap 3.2.0, bootswatch 3.2.0, chosen 1.1.0, datetimepicker 2.3.0
• Migrate Express4.4.4 #55
• Migrate Hogan 3.0.2
• Fix pg filter by boolean type
• Fix always use aliases when joining tables in listview #59
• Fix chosen select controls are hidden by default to improve performance
• Fix filter columns have default value set to null
• Fix sqlite string concat on null values
• Translation Korean translation #63
• Docs greatly improved events documentation