v1.8.0

• #92 Add support for multi-row header
• Add placeholder for search input field (#93) Thanks @Walther
• update lastIndex when arrangedContentLength is changed (#96) Thanks @saygun
• Added more templates (#97) Thanks @listepo
• Added showPageSize property (#100) Thanks @listepo
• Added warn if not use query method for loading data (#101) Thanks @listepo
• Wrapper for sorting query (#102) Thanks @listepo
• Custom filter title (#103) Thanks @listepo
• Observe properties after component render (#104) Thanks @listepo
• [BREAKING] #105 ember-get-helper is deprecated after ember 2.0, causing warning
• #106 Focus to Global search