v1.0.27

Fixed

• #3183 fix prop validation failure with propsData (#3193 by @kazupon)
• #3184 textarea with v-pre attr should skip compile (#3202 by @hylin)
• #3187 fix error processing single-letter hyphenated props
• #3204 fix $refs not updated correctly inside v-if (#3217 by @kazupon)
• #3210 fix filter arguments parsing when it contains spaces (#3734 by @defcc)
• #3273 handle backticks in expression (#3273 by @skyronic)
• #3307 v-model checkbox updates should replace the bound array
• #3668 fix required prop warning when using propsData
• #3730 fix iOS 10 UIWebView update bug with new nextTick implementation